Question

must have done sth造句？

Answer 1

must have done过去一定做了某事，根据must的本意即可推敲出意思。
The lights were out. They must have been asleep. 灯灭了，他们应该睡觉了。
The ground is wet.It must have rained last night.地面很湿,昨晚一定是下过雨了。
You must have seen him. 你想必曾经见过他了。
The door droops a little; there must have been something wrong with the hinges.
门有点下坠，铰链一定（想必曾经）出了问题。
You must have seen her if you had been here yesterday.
要是昨天你在这里，你一定见到他了。
（实际上昨天你并不在这里，所以昨天实际上你不曾见到她。）
Any applicant for this position must have practised for six years.
凡申请该职务者，必须具有六年的实践经验。

Answer 2

造句如下～
They must have done something to us.
他们一定对我们做了什么。

Answer 3

you must have seen this movie.