同学,你好。现在我就结合例句来给你讲述一下该如何回答由情态动词引导的句子。 —Must I do it at once? —No,you ____ . A.mustn't B.needn't C.can't D.don't 此题应选B。一般说来,以must 引出的一般疑问句,其否定回答通常是用 needn't(=don't have to),这与其说是一个语法问题,不如说是一个语境或上下文是否通顺的问题。 注意以下各组问答句,并注意体会其汉语译文: 1.—Must I come before dawn?我必须天亮前来吗? —Yes, you must.是的,必须天亮前来。 —No, you needn't.不必天亮前就来。 —No, you don't have to.不必天亮前就来。 2.—May I smoke in the room?我可以在这个房间抽烟吗? —Yes, you may.当然可以。 —Of course you may[can].当然可以。 —No, you may not[mustn't,can't].不行。(语气较生硬) —You'd better not[Better not].最好不要抽。 —I'd rather you didn't.还是不抽的好。 —Please don't.请不要抽。 3.—Need I finish it today?我必须今天完成它吗? —Yes, you must[have to, should].是的,今天必须完成它。(肯定回答不能用Yes,you need,因为情态动词need 只用于否定句或疑问句,不用于肯定句) —No, you needn't.不必今天就完成它。 —No, you don't have to.不必今天就完成它。 4.-Can you finish the housework before 7? -Yes,I can/No,I can't
may肯定回答:Yes,you may/can.否定回答:No,you musn't/can't.