情态动词一般疑问句否定回答的情态动词和疑问词不同
问题描述：
情态动词一般疑问句否定回答的情态动词和疑问词不同
例如must i...no you do not have to
答
May I come in?No,you can't.Must he wait here?No,he needn't.Could you help me?Sorry,I can't.Might she drop it?No,she can't.Would you please open the door?Sorry,I can't.