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Unit 27. Could (do) and could have (done)
(использование оборотов could (do) и could have (done))

We use could in a number of ways. Sometimes could is the past of can (see Unit 26): But could is not only used in this way. We also use could to talk about possible actions now or in the future (especially to make a suggestion). For example:
Unit 27. Could (do) and could have (done)
  • A: What shall we do this evening?
    B: We could go to the cinema.
  • It's a nice day. We could go for a walk.
  • When you go to New York next month, you could stay with Barbara.
  • A: If you need money, why don't you ask Karen?
    B: Yes, I suppose I could.

Can is also possible in these sentences ('We can go for a walk.' etc.). Could is less sure than can.
You must use could (not 'can') when you don't really mean what you say. For example: We also use could to say that something is possible now or in the future: Can is not possible in these examples (not 'It can be Tim'). In these sentences could is similar to might (see Unit 29 and Unit 30): Compare could (do) and could have (done): Most often, we use could have (done) for things which were possible but did not happen: Sometimes could means 'would be able to…': Could have (done) = would have been able to (do): See Unit 28. couldn't have (done)
(использование оборотов must и can't).
See Unit 29. Could and might
(использование оборотов may и might 1).
See Unit 36. Could I/you …?
(использование оборотов Can/ Could/ Would you …?).
See Unit 37. Could with if
(использование оборотов If I do … и If I did …).
See Unit 38. Could with if
(использование оборотов If I knew … и I wish I knew …).
See Unit 39. Could with if
(использование оборотов If I had known … и I wish I had known …).
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