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最佳答案：没有这种用法,多数用“No,you can't.”而且用“may”提问表示你们俩并不很熟,很礼节性.所以否定也要稍微委婉一些,比如“I'm afraid not
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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：可以.如：May I use this pen?No,you can't.此句中can't表示你绝不可以的意思.
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最佳答案：B
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最佳答案：must:肯定must（必须）,否定must not/mustn't/needn't（不准,禁止）He mustn't be there 他一定不在那儿.Mus
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最佳答案：mustn'tMust才用needn't
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最佳答案：need /needn'tmust /mustn'tmay /may not
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最佳答案：may i use your penYes,you canno,you may not.or you mustn'tNeed i start from the
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最佳答案：Signs are important in our daily life.You may see a board with a letter "P" in a
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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