CAN
*Use to ask for permission
(Can I go to the movies tonight?)
*Use for something possible or not
("Do you think he can win the race?")
*used to suggest something might happen in the future
("If you finish your homework, we can go to the movies.").
COULD
*Could is also used to refer to something that you wish to have or do but that is not possible ("If only we could be free of this tyrant!").
*It’s also used to describe something that was possible but did not happen, used with the verb have
("We could have won if we had practiced harder.").
*Could can also express annoyance or another strong emotion
("He could have asked me if I needed help!" or "I could have died I was so embarrassed!")
When making general polite suggestions or asking a question, both could and can are possible ("Excuse me, can/could you tell me what time it is?")
WOULD
*Would is used to talk about a possible situation that has not happened or that you are imagining
("I would quit my job if I won the lottery.")
*It is also used with have to describe a situation that could have happened but did not
("She would have eaten less if she had known there was going to be dessert.").
Would can also be used to ask polite questions ("Would you mind if I had another cup of tea?"),
To wish for something
("I wish she would write a book.").
It is used to give opinions
"I wouldn't do that if I were you,"
"I would say that she is in her 30s. [=it is my opinion that she is between 30 and 39 years old]");
It is used to express a willingness to do something
("I would be happy to take her to the airport");
It is used to express frustration with something that you believe a person always does ("Well, he would say that, wouldn't he? He always says that!").
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