Mostrando postagens com marcador tempos verbais. Mostrar todas as postagens
Mostrando postagens com marcador tempos verbais. Mostrar todas as postagens

segunda-feira, 7 de março de 2016

A Summary of English Verbs in Review

English Verbs 201- by Michael fuller

English Verbs 201- by Michael fuller
Before beginning this presentation of verb tenses, it is important to remind ourselves that with all grammar explanations of verb tenses we have two focal points necessary to mastering verbs: the use (when to use the verb in its correct tempo/tense) and the structure (how to form the successful structure of these verbs). To save space, I have eliminated the presentation of the structures and can expand on this during the class. It is worth mentioning that the outline of English verb structures follow the pattern of affirmations (positive sentences +), negations (negative sentences -) and interrogative sentences (classic question structures ?).

Simple Present: We use simple present to express habits, routines, and scientific facts.

Habit: They always take a towel with them when they go to the beach.

Routine: I brush my teeth three times a day.

Scientific facts: The earth revolves around the sun.

The name ‘simple present’ can confuse the learner because this verb tense runs through the past, present, and into the future by custom. There are some structural elements worthy of attention.
With the exception of the extremely irregular verb “can”, all other verbs end with an (s) in the third person singular. This includes the verb to be- is. The verb “to be” has three forms (am/is/are) in the simple present, while all other verbs (except ‘can’) have 2 forms (the form with the “s” and the form without- eat/eats).

*It is important to the Portuguese speaker to note that in English we use the simple present in place of the present subjunctive of Portuguese. This is because there is no existent subjunctive case in English. Exempli gratia: Eu como para que tenha energia. I eat so that I have energy. (Neste caso, também poderíamos usar o modal verb “may”).

Regular and irregular verbs: In the simple present tense we can remember very easily which verbs are irregular if we understand the reason why. The vast majority of these irregular verbs are irregular due to pronunciation. “Brush” and all other verbs ending in “sh”, “ch”, and “ss” have an added “es” to make the pronunciation clearer. (brushes, catches, stresses). Verbs like “have” become “has” for simple pronunciation reasons.

Simple Past: Simple past verbs are used to express an action that happened in the past, independent of other actions, and is no longer happening. This is in direct contrast with present and past perfect, as we will see. This verb can be understood as the preterit indicative of Portuguese: example: I took an aspirin before class. Eu tomei aspirina antes da aula. The imperfect indicative: She always arrived late. Ela sempre chegava atrasada. (Podemos usar “used to arrive” para claridade.) And also the imperfect subjunctive: If I lit a match, there would be an explosion. Se eu acendesse um fósforo, haveria uma explosão. (Quando usamos past perfect para expressar uma ação antes de outra ação no passado, o verbo que aconteceu depois sempre vem no caso de simple past. Exempli gratia: They had already left by the time he got there.

Irregular verbs in the simple past do not all have a pattern for reasoning. It is best to memorize them through use. This can be easy since 1st, 2nd, and 3rd person singular and plural are all the same with the notable exception of the verb “to be”, which has 2 forms (was/were). Here it is necessary to explain that when we use verb “to be” in the imperfect subjunctive equivalent (second conditional phrases most often), “was” is eliminated in formal English and I/she/he/it use the “were” form. E.g.- If I were you, I would take an umbrella.

Infinitives: Infinitives are extremely important since they are the dictionary form of verbs. This is the form of the verb in its base form with the “to” attached. For beginners, this “to” appears to be the preposition “to” (para/por/a) and can cause confusion. It is important to simplify this and make the “to” represent the (r) at the end of Portuguese verbs (ar/er/ir). The important part for Portuguese speakers is knowing that infinitives are not always interchangeable between English and Portuguese. Many times in English, we use the gerund form of the verb where Portuguese uses the infinitive; we see this in the previous sentence of this paragraph. E.g.- is knowing that- é saber que. We can see this most frequently after prepositions. E.g. My sister insists on kneeling upon entering a church. A minha irmã insiste em se ajoelhar ao entrar numa igreja.

In book 2 of Four Corners (unit 12), we see the use of prepositions to express purpose. Here the “to” actually does function like the “para” of Portuguese.  E.g. I’m taking a class to learn English. Estou fazendo um curso para aprender ingles. I’m saving money to buy a car. Eu estou economizando dinheiro para comprar um carro.

Present Perfect: With present perfect we express an action that has started in the past and touches up to the present moment. (Structure is have+past participle.) We can use a timeline to visualize this.
Past                                                      Present                                                              Future
|_____________________________|__________________________________|
           |              |                                      |
     (S. Past )           ( Present Perfect)

We can see that the simple past (represented by the red bar) is an action that happened in the past and finished. The present perfect, in contrast, (represented by the purple bar) started in the past and continues up to the present moment. Just like with all verb tenses, we can pick up on key words to tell us if we should use the present perfect tense. The most common of these is ever. Ever should never be translated as “sempre”, but in the case of present perfect seems to indicate “desde algum ponto no passado até e incluso agora”. This can be “desde que você nasceu”, “desde que você começou na escola”, “desde que você mudou para Espirito Santo”. [O present perfect pode ser usado na pergunta para localizar o tempo em que ocurreu uma ação e a resposta pode ser no simple past.] Let’s see some examples.

Have you ever eaten octupus? R. I ate it once when I went to Rio.

*We can use present perfect when we want to express something that we have never done in our lives. E.g.- I haven’t ever seen a live tiger. Eu nunca vi um tigre ao vivo.

* We can use present perfect when we want to add various degrees of emphasis to an action that happened in the past. E.g. We have completed book 2. Nos já terminamos o livro 2. Notice that in Portuguese you can add the “já” to give the same emphasis while retaining the same verb.

Past Perfect: We use the past perfect (pluperfect indicative) tense to give order to two actions in the past. There are two verbs in the past and one happens before the other. The first action to occur will always use the past perfect. (Structure is had+past particple.) E.g.- I had already eaten when she brought the food. Eu já tinha comido quando ela trouxe a comida. First I ate food, then she brought food. This order is not always first in the collocation. The first action in time can be the last action mentioned; it can come at the end of the sentence. E.g.- The ground was wet because it had rained. O chão estava molhado porque tinha chovido.

Present Continuous: We use the present continuous to express an action that is happening in this moment (right now) or in this time period (these days). This uses the gerund form of the verb (-ing) with verb to be. E.g. I am taking an English class these days. Estou fazendo um curso de ingles hoje em dia. I am eating a sandwich on the subway right now. Eu estou comendo um sandwiche no metrô agora mesmo.

We can also use present continuous to express fixed plans about the future or a future event that will be temporary. E.g- After class, we are having a cook out. Depois da aula estamos tendo um churrasco.

Past Continuous: Past continuous is commonly used to express an action that was taking place when another action occurred. E.g- I was walking to the store when I saw the crash. Eu estava caminhando pela loja quando vi o accidente. What were you doing when they called? O que que você estava fazendo quando eles ligaram.

Modal verbs: A list of important modal verbs is may, might, would, will, could, should, ought to, shall, must.

“May” expresses probability and is more formal or less used. E.g. It may rain today, but I really don’t know. It can also be used to formally ask for permission in the 1st person sentences. E.g.- May I get a drink of water.

“Might” is used in the same sense as “may”. We could say that might is more often used. I might have to go to get some milk if it runs out.

“Would” is used as a polite way to ask someone if they want something or ask for something. E.g.- What would you like to eat? I would like a hamburger. “Should” and “could” are used interchangeably with “poderia” and “deveria” with the exception of “could” when it is the past of “can”.

“Will” is used to state plans, predictions or future events. E.g.- I’ll have a hamburger. I think it’ll rain tomorrow. The negative contraction is always “won’t”. This modal verb stands in direct contrast to the more often used “to be going to” that is more often used in future expressions that are certain and fixed.

“Ought to” expresses obligation in the form of a suggestion. This is a sense less urgent than “must”. It expresses a suggestion to what you think someone should do. E.g. You ought to call your mom and let her know that you’re okay. Você deveria ligar a sua mãe e informá-la que está bem.

“Must” is an absolute obligation. It does not suggest but informs one as to what is their responsibility. E.g.- Employees must wash hands before returning to work. Os funcionarios devem lavar-se as mãos antes de retornar ao trabalho. In this case, if you say “ought to” it sounds like you leave it to the employees to decide if they want to or not. “Must” can also be used for inference (dedução). E.g. She´s late. She must be at the beauty salon.- Ela deve estar no salão de beleza.

“Shall” is an archaic form of “must”. It can be used for strong emphasis, formal situations or even irony. E.g. Shall we dance?  Biblical examples can be found in the ten commandments: “Thou shalt not kill”- “You shall not kill”.

Zero, First, Second and Third Conditionals: Conditionals use an “if/when” clause and together with a main clause to express a hypothetical idea. (Futuro do subjuntivo is used in Portuguese).
Zero Conditional uses two simple present verbs to describe things that are generally true. E.g.- If I have a really important exam, I study a lot. Se eu tiver uma prova importante, estudo muito. I get sick if I drink beer. Eu passo mal se eu beber cerveja.

First Conditional uses the modal verb “will” in the main clause and s. present in the if clause to express a prediction or result. E.g.- I will be late if it rains. Eu chegarei atrasado se chover. If it is hot out, I will need to take the bus.

Second conditional uses the modal verb “would” in the main clause and the s. past in the if clause to explain imaginary situations. E.g.- If you went to China, you would learn Mandarin. Se você fosse a China, aprenderia Mandarim.

Third conditional uses past perfect in the if clause and “would have”+ the past participle in the main clause to express a different possible past/imagining different past results. E.g.- If I had known about the car’s engine problems, I wouldn’t have bought it. Se eu soubesse sobre o problema do motor do carro, não o teria comprado.

Modal verbs with present perfect or past perfect continuous conditionals can express alternate endings or results to situations if something different were done. E.g. I should have studied harder. I would have gotten a better grade. Eu deveria ter estudado mais. Teria conseguido uma nota melhor. With “will” we can express a determined future result if something occurs. This can also combine with the gerund and becomes a continuous. I will have been working here for 2 years in August. You would be eating lunch if you were at home.

Present and past perfect continuous: present perfect continuous [have been+present participle] expresses an action that started in the past and is not yet finished. E.g.- We have been studying English for 2 years. Nos estamos estudando ingles já dois anos. ( In Portuguese the time expression “já” can appear to express that it is not yet finished.) Let’s compare with present perfect. I have lived here for two years. Eu moro aqui há dois anos.  O foco é a permanência no local onde a pessoa mora – já está lá há 2 anos e dá a entender que a ideia é continuar ali. I have been living here for two years. Eu estou morando aqui já dois anos. Aqui usando na forma continua expressa ênfase e poderia estar entendidoque não é um estado permanente.

Past perfect continuous  [had been + present participle] is used to express that something started in the past and continued up until another point in time in the past when another past action occurred. You had been talking for five minutes when I asked you to keep quiet. Você tinha estado falando por 5 minutos quando pedi que calasse. The time expression “for five minutes” is the palavra chave (key word) in this phrase.

Future Perfect Continuous (Progressive): [will have been+ verb-ing]Future perfect continuous is used to express an action that was occurring for a period of time before another action in the future or the cause of something that will happen in the future. E.g. She will have been working at the company for ten years by the time I retire. He will be tired by the time he arrives because he will have been traveling all day.

 Perfect Continuous Conditional The perfect continuous conditional can be used in type 3 conditional sentences. It refers to the unfulfilled result of the action in the if-clause, and expresses this result as an unfinished or continuous action.
If clause (condition)
Main clause (result)
If + past perfect
perfect continuous conditional
If this thing had happened
that thing would have been happening.

E.g. If I had known it about the new book, I would have been reading it yesterday.
I would have been studying if I had known about the test.


Imperative case- The imperative form of verbs is the easiest to understand. We can simply remove the “to” from the infinitive and exclude the subject. This is the only case in English that does not require a subject. To express this we state that it is the “understood you” (o you subentendido). When speaking in the imperative case, we are always speaking to the second person (ouvinte). E.g. Take the trash out, please. –Leva o lixo for a, por favor.


segunda-feira, 15 de junho de 2015

Mais sobre Present Perfect- in English



Nota:Lembran-se que o uso de present perfect para as pessoas que falam portugués pode parecer um pouco complexo no começo.  Eu prometo que não é.  Porém estou adicionando esta postagem para ser como um suplemento para eles que já estudarem bastante o tema, por isso escolhei botar tudo em inglês, para que esforcem mais. Se tiver dúvida pode perguntar até em português.  Vale ler esta postagem em português primeiro PRESENT PERFECT vs. PRETÉRITO PERFEITO COMPOSTO. 

Lembram-se também que além do uso de ênfase, temos o uso principal de fazer ou responder (afirmações) sobre 
1) o tempo de hoje (o presente) para atras, o que descrevo assim "uma vez na sua vida" 
e também
2) para um tempo definido até hoje (o presente), o que descrevo por uma quantidade de tempo.

O primeiro exemplo usa palavras de frequência e as mais comunas são ever, yet, already e never.  Exemplo: Have you ever went to the bakery on first avenue?
                                                   No, I never have.

O segundo exemplo refere-se desde que algo aconteceu até agora mesmo. Palavras-chaves são for, since, in juntadas com uma quantidade de tempo.
Exemplo:  Have you seen my cellphone? ( está implicado "since I lost it" e pode estar incluído).
                       No, I haven't seen it (since you lost it).  Aqui não está dizendo que uma vez na sua vida porém desde aconteceu tal ação até o presente.

Sobre estes temas se trata este artigo em inglês. Enjoy! 


Present Perfect Meaning #1

Present perfect + a length of time

Part 1:
The Basics




1. What does present perfect meaning #1 mean?

When I use present perfect with a phrase that shows a length of time
like “for two hours,” “since 1911,” “since I came to America” or “twenty
minutes,” then it usually means that the action started in the past and has
continued until now.

Examples:
Norton has studied English for the past three semesters. (Norton started
studying three semesters ago and has continued until now.)

Ludwig has worked at McDonald’s since last March. (Ludwig started
working there last March and has continued until now.)

Fred and Ethyl have owned this building a long time. (Fred & Ethyl
bought the building in the past and have continued to own it until
now.)

Has Lulu worked at Costco since she graduated from high school? (I
want to know if Lulu started working when she graduated and
has continued until now.)

I haven’t seen Norton for three years. (This situation [not seeing Norton]
started in the past and has continued until now.)

Why have you been quiet for so long? (I want to know why you started to
be quiet in the past and have continued to be quiet until now.)

Joe hasn’t smoked ever since his doctor told him to stop. (Joe stopped
smoking when his doctor told him to and this situation has continued
until now.)

Melvin has smoked since he was seventeen. (He started this habit when
he was seventeen and has continued the habit until now.)


Part 2: 

More That You Should Know about Present Perfect Meaning #1 

1. When should I use present perfect meaning #1?--A simple rule 

Present perfect meaning #1 and present perfect progressive mean the same thing; they both mean that the action started in the past and has continued until now. If we draw a picture of this meaning, it looks like this: 

                    past time              right now            future time
                                                        l
                                                        l
                                                        l
                                                        l
The action started in the past,             l
 unit now.                                          l
_______________________________l_______________________________                         l                                 l
                      l                                 l
                      l                                 l
                      l                                 l
                      l_________________>l  unit now.    
                         has continued           l                     
                                                        l
                                                        l


If present perfect meaning #1 and present perfect progressive mean the same thing, that raises the question, “How do I know when to use present perfect and when to use present perfect progressive?” I’m going to give you a simple rule that you can use. If you follow it, you’ll always create a correct sentence, even though there may be other correct ways to say the same idea: 

SIMPLE RULE: 
When you want to show that an action started in the past and has continued until now, 
*for most verbs, use present perfect progressive, but 
*for stative verbs, use present perfect meaning #1 (in other words, present perfect + a length of time). 

Examples: 
          Betty and Barney have been eating dinner for forty-five minutes. (For most verbs, use present perfect progressive) 
          Wayne has been doing his Chinese homework since 7:00. (For most verbs, use present perfect progressive) 
          Barney has known Fred since they were little kids. (For stative verbs, use present perfect + a length of time.) 
          Homer has loved Marge since they were in high school. (For stative verbs, use present perfect + a length of time.)  

If you want the complete story on when we use present perfect meaning #1 and when we use present perfect progressive, see “I want to know more than the simple rule! How are meaning #1 and present perfect progressive different?” 

2. Using since, for, and in 
We often use since, for and in with present perfect meaning #1 to show a length of time. Let’s look at each one individually. 
A. Using since with meaning #1 
*We almost always use since with a point in time. 1 

1 Examples: 
I have taught at Chabot since 1992. 
                                   since June, 1992. 
                                   since June 12, 1992. 
                                   since 10:00 a.m. on June 12, 1992. 
                                   since I moved to El Cerrito. 

Sometimes you’ll hear an American use since + a present perfect clause (e.g.-- I’m so blue since you’ve been away), which is different from since + a point in time. It’s also a lot less common. If you’d like to find out more about it, there’s a brief discussion in “Since + a present perfect clause” on p104.. 1 1 Since can have another meaning; it can also mean because. For example: “Since (because) she was feeling sleepy, Lucy decided to make a pot of coffee.” This is a completely different meaning from since + a point in time. 

IMPORTANT NOTE: 

Since + a point in time is only used with perfect tenses. Theoretically, it can be used with any perfect tense (although we don’t use it very much with future perfect tenses. For is a lot more common with future perfect and future perfect progressive). 

Examples: 
Ricky has worked at the Copacabana since 1998. (present perfect) 
Wayne has been studying Cantonese ever since he fell in love with a Chinese girl. (present perfect progressive.) 
Melvin was crushed when he learned the truth. He had believed in Santa Claus since he was a child. (past perfect) 
Mary pulled over to the side of the road for a nap. She had been driving since the sun came up. (past perfect progressive.) 
John’s going to be exhausted when he gets off work tonight; he will have been working since five this morning. (future perfect progressive.) 

IMPORTANT POINT TO REMEMBER: If you use since + a point of time, you need to use a perfect tense! 

B. Using for with meaning #1 

We use since with a point in time, but we use for with a length of time. 

Examples: 
I have taught at Chabot for thirteen years. 
                                   for two months. 
                                   for three weeks. 
                                   for ten minutes. 

If we want, we can omit for and just say a length of time: 
Examples: 
I have taught at Chabot thirteen years. 
                                   two months. 
                                   three weeks. 
                                   ten minutes. 


Although since + a time is only used with perfect tenses, for can be used with almost any tense. (The exception is present progressive. We almost never use time phrases with present progressive.) 

Examples: 
Trixie has lived in New York for fifteen years. (present perfect) 
When I was young, I lived in Hawaii for two years, but now I live in California. (simple past) 
Don’t cry, honey. I’ll only be in Iraq for a few months. (future) 
Fred and Barney were bowling for three whole hours last night. (past progressive) 

Using in with meaning #1 
If we want to tell the length of time a person has not done something, then we can use either for or in. Both are okay and they mean the same thing when we use them in this way. 

Examples: 

You haven’t written your mother for a long time. You should write her today. She may be getting worried about you. 

You haven’t written your mother in a long time. You should write her today. She may be getting worried about you. 
(These two sentences mean the same thing.) 

John hasn’t practiced the piano for two years, but he wants to start playing again soon. 

John hasn’t practiced the piano in two years, but he wants to start playing again soon. 

We only use this meaning of in with present perfect, past perfect, and future perfect. 


Source: English Verb Tenses

quinta-feira, 11 de junho de 2015

PRESENT PERFECT vs. PRETÉRITO PERFEITO COMPOSTO



O tempo verbal present perfect expressa um ação que parou e as vezes pelo contexto pode estar entendido que ainda está acontecendo (por isso present), porém a ação tem influência sobre o momento presente.  A função é para dar ênfase ao resultado. 

Present Perfect Structure

PositiveNegativeQuestion
I / you / we / theyI have spoken.I have not spoken.Have I spoken?
he / she / itHe has spoken.He has not spoken.Has he spoken?
Lembra-se que as formas combinam o presente de have com o past participle. Os regular verbs somente acrescentam com -ed (ex. I have cleaned the house now.).  Refere-se a uma lista de irregular verbs para ver os past participles dos irregulares, o spoken usado em cima é irregular. 

*Para perguntas, igual que do questions, o sujeito está colocado no meio do auxiliary verb e o main verb.

nota: Quando a pergunta usa o tempo verbal present perfect, pode responder com o short answer "Yes, I have.", sendo que have não está usado no sentido de posse e não precisa de um comprimento.

exemplo:
Have you seen my English book?

               + Yes, I have.  It's in the classroom.         - No, I haven't.      
                                                                         
(A contração sempre toma lugar no "not" e nunca no sujeito)      

Quando Usar o tempo verbal Present Perfect?


Para explicar esto, primeiro vamos olhar ao tempo correspondente em português.  Em português este tempo tem o nome pretérito perfeito composto e o uso é bem semelhante.  A estrutura é idêntica, usando ter (have) no presente combinado com o past participe (regular verbs suffixes -ado, -ido).  O uso é para expressar ações que começaram no passado e continuam no presente em um sentido de hábito ou repetição (quase como simple present também de inglês). 
Exemplo: 
Tenho estudado muito inglês recentemente. E você? O que tem feito?

Então por causa disso, quando se usa em português, sempre vai poder usar no mesmo sentido neste caso, somente que há instancias que usamos em inglês o present perfect e o mais comum em português seria o tempo pretérito perfeito do indicativo.
Exemplo:   Estive na Europa.                I have been to Europe.
                 Roma já falou.                    Rome has already spoken.

Explicação:  Nestes exemplos estamos vindo a diferença entre o uso do present perfect e sua contrapartida em português o pretérito perfeito composto que não foi usado nos exemplos em cima.  Agora bem, a explicação é mais simples que imaginara.  Como falado no inicio desta entrada, é somente para dar ênfase.  Entendeu?  Se estiver falando "estive na Europa" no contexto de ter viajado uma vez à Europa então vai quer dizer: "I have been to Europe".  Se somente quiser dizer que estive na Europa quando alguma outra coisa aconteceu ou por um tempo específico, usaria o tempo simple past: "I was in Europe for a few days".  "I was in Europe when you called."

Em geral, quando é para ênfase, o uso é assim:
  • Dar ênfase ao resultado
    Exemplo: Dr. White has written three books. (o resultado-3 books- recebe ênfase do verbo)
  • Um ação que ainda está acontecendo
    Exemplo: The new semester has not started yet. (not starting está acontecendo no momento)
  • Um ação que parou recentemente
    Exemplo:  She has baked cupcakes for everyone. (também da ênfase especial à ação feita)
  • Uma ação que aconteceu e afeita o momento presente
    Exemplo: P: What happened?  R:  I have lost my new cell phone.
  • Um ação que aconteceu uma vez, nunca ou varias vezes antes do momento de falar.(time ex.)
    Exemplo: I have never been to São Paolo.

Anotem-se que se pode usar o simple past nestes exemplos!


Pode sim! Mas o significado é com menos ênfase. É somente o último exemplo que não pode usar o simple past e terá o mesmo significado.

  • Dr. White wrote three books.

  • The new semester didn't start yet. (AmE, a diferença é sutil, present perfect é                                                                 preferido na frase)
  • She baked cupcakes for everyone.

  • P. What happened?    R. I lost my new cellphone.
Agora vamos falar sobre esse último e dar mais exemplos.
Esta última forma não tem o mesmo sentido se colocar com o tempo simple past.  

_____you_____ Hawaii yet this year?   (visit)

_____you_____ Hawaii this year during the carnaval.    (visit)

O primeiro exemplo é mais em geral.  Não está especificado quando exatamente.  Somente sabemos que se refere a este ano, porém tem mais uma dica aqui.  É o yet (já). "Yet" é um time expression.  Neste instante é a palavra-chave. No segundo exemplo sabemos exatamente quando se refere: durante o carnaval.  Então as respostas seriam as seguintes:

Have you visited Hawaii yet this year?  Não funcionaria com o tempo verbal no simple past.  E podemos ver do exemplo negativo a mesma coisa:  "I haven't visited Hawaii yet this year".  Então por causa do "yet" sabemos que podemos usar o present perfect.   (A afirmação neste caso usaria "already"- realmente already e yet dão ênfase que não aconteceu ainda ou já aconteceu.  "I've already visited Hawaii this year."  Presta atenção à colocação.

Did you visit Hawaii this year during the carnaval?  This year during the carnaval, quer dizer um tempo especificado sem o time expression.  Também pode ser: "Did you visit Hawaii for a few days?".  "Did you visit Hawaii for your birthday?".  "Did you visit Hawaii this year with James?"  Estes exemplos não usam os times expressions e é por isso que eles usam o simple present.

Mais uns contrastes:

  • Did you have baked potatoes for lunch?
  • Have you ever had baked potatoes for lunch?

  • Did you swim in the lake this evening?
  • Have you ever swam in a lake?

Presta atenção ao contexto nestes 2 exemplos porque nos dizem algo importante.  No primeiro simple present está perguntando se comeu batata ao forno para o almoço. Do jeito que aparece, entendemos que está perguntando sobre hoje mesmo.  No exemplo com present perfect está perguntando se já comeu batata, e entendemos que está perguntando sobre uma vez na sua vida, já uma vez...

No segundo exemplo está perguntando sobre tomar banho na lagoa.  Pergunta se tomou banho na lagoa hoje a partir da tarde.  É uma lagoa especifica (também pode ser "uma lagoa" só foi o exemplo que escolhei).  No exemplo com present perfect está perguntando se já tomou banho em uma lagoa (qualquer que seja em qualquer momento de sua vida), já tomou banho em uma lagoa uma vez?  Por isso usamos o present perfect. 

Palavras-chaves do PRESENT PERFECT



     
  • already, ever, just, never, not yet, so far, till now, up to now