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最佳答案：yes,you can./no,you can't.yes,you must./no,you needn't.yes,you need(must)./no,yo
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最佳答案：否定may用can't或mustn't肯定用can回答
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最佳答案：weren,t
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最佳答案：肯定Yes,I'd love to.That's a good idea.Why not?否定Sorry,...I'd love to,but...
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最佳答案：No,you don't have to.
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最佳答案：肯定回答：yes,you can.否定回答：No,you can't希望能够帮到你.
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最佳答案：not 一般是放be 动词 和 can 之后 如he is not happy.my key is not here.I can not do that.don