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最佳答案：否定句:He can't swim.疑问句:Can he swim?肯定回答:Yes,he can.否定回答:No,he can't
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最佳答案：否定句：he can't paint ; she can't sing ; I can't dance一般疑问句:can he paint can she si
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最佳答案：是的,可以.could既可以作为can的过去时又可以作为can来用.couldn't 相对应的就是can't
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最佳答案：Can David play the violin?Yes,he can.No,he can't.David can't play the violin.
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最佳答案：must:yes,you must. no,you needn't.should:yes,you should. no,you needn't.need:Yes
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最佳答案：Can they help us? No,they can't.
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最佳答案：否定句：you can not listen to music outside .疑问句：can you listen to music outside肯定回答
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最佳答案：否定句：My parent can't paint very well.一般疑问句：Can your parent paint very well?肯定回答：Y
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最佳答案：肯定句：I can speak English.否定句：I can't speak English.一般疑问句：Can you speak English?特殊
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最佳答案：Can you see the cat?No,I can't希望可以帮到你