We use can to:. We use can to talk about what is possible, what we are able or free to do:. Normally, we use can for the present. But it is possible to use can when we make present decisions about future ability.
We often use can in a question to ask somebody to do something. This is not a real question - we do not really want to know if the person is able to do something, we want them to do it! The use of can in this way is informal mainly between friends and family :. Note that we also use could, may, might for permission. The use of can for permission is informal.
Could is an auxiliary verb, a modal auxiliary verb. We use could to:. We use could to talk about what was possible in the past, what we were able or free to do:. We use I positive and couldn't negative for general ability in the past. I won't have any time later. I can't help her then. I can drive Susan's car when she is out of town. I can drive Susan's car while she is out of town next week. I can't drive Susan's car when she is out of town. I can't drive Susan's car while she is out of town next week.
Can I have a glass of water? Can you give me a lift to school? Requests usually refer to the near future. Can't I have a glass of water? Can't you give me a lift to school? Should vs Shall Legal explanation. Is class Finished or Ended? What is the difference between Finish and Complete?
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