![]() ![]() ![]() We sometimes say cannot, but it is very emphatic. The negative form is can't in spoken English and cannot in written English. We make questions by putting the subject after can/ could: Can I. We use could you … as a polite way of telling or asking someone to do something: We use can't to refuse permission or say that someone does not have permission: We use can to say that someone has permission to do something: We use can to ask for permission to do something:Ĭould is more formal and polite than can: She could have learned Swahili, but she didn't want to. ![]() We use could have to say that someone had the ability or opportunity to do something, but did not do it: We use could and couldn't to talk about the past: We use can and can't to talk about the ability to do something at a specific time in the present or future: We use can and can't to talk about someone's skill or general abilities: If Jones was at work until six, he couldn't have done the murder. We use can't have or couldn't have to say that a past event was impossible: (= It was sometimes very cold there in winter.) We use could to make general statements about the past: Where are they? They could have got lost. We use could have to make guesses about the past: We use can't or cannot to say that something is impossible: (= It is sometimes very cold here in winter.) We use can to make general statements about what is possible: We use could to show that something is possible, but not certain: Level: beginner Possibility and impossibility ![]()
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