They must have gone there two days ago,did not they?We must

来源：学生作业帮编辑：作业帮分类：英语作业时间：2024/10/04 15:42:51

They must have gone there two days ago,did not they?We must go right now,need not we?
二句都有must,为何反义疑问句的句末不一样呢?
did not they?与need not we?

两个句子的must 含义不一样
第一句must have gone ：一定是已经去过那儿了,must用于强调过去发生的事实以及说话人的肯定程度.
第二句must go right now:我们必须现在就要出发,must表示必须的程度,说话人的意思是想问,是不是真的需要现在就出发.

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