你好。must在这里是表猜测的,解释为“肯定,想必一定”。教你一个简单的方法:
将must变成I am sure + 去掉must的句子,谓语动词随“当时”,看例句吧,这样更容易理解:
1 You must have made the mistake,haven't you ?
== I am sure you have made the mistake, haven't you?
2 They must have stayed at the hotel last night, didn't they?
== I am sure they stayed at the hotel last night, didn't they?
我相信,你已经看懂了。简单吗?
现在,你完成下面三句:
She must have been to the headmaster's office,___________?
She must have been in the headmaster's office (yesterday) ,____________?
She must have left before he arrived,___________?
(hasn't, wasn't, hadn't )
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