must have done sth.對過去情況的推測,本身有可能是過去時,也有可能是完成時.意為：肯定
如：
He has been to Beijing .-----He must have been to Beijing.(完成時）
It rained last night----It must have rained last night (過去時）
have 也是動詞原形.
they must have lost your letter in the post.
they must have lost your letter in the post.
They must have lost your letter in the post
改被動語態(tài)
your letter must have been lost by them in the post
1、有MUST的是什么時態(tài).
2、MUST后不是直接跟動詞原型嗎.
They must have lost your letter in the post
改被動語態(tài)
your letter must have been lost by them in the post
1、有MUST的是什么時態(tài).
2、MUST后不是直接跟動詞原型嗎.
英語人氣：894 ℃時間：2019-11-11 18:45:18
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