must,need,引导的疑问句回答方式有什么不同?
问题描述：
must,need,引导的疑问句回答方式有什么不同?
答
Must I go off now Yes,you must.No ,you needn't/don't have to.(否定形式mustn't是禁止、不许,所以不用)Need I gave him a hand Yes,you must/should.（ 情态动词need不用于肯定句中）No,you needn't....