简单地说：对过去情况作推测,用must have been；所对现在情况作推测,用must be.比较：He must be ill. 他一定是病了.（指现在有病）He must have been ill. 他当时一定是有病 / 他一定生过病.（指过去有病）He must ...
标签：must
简单地说：对过去情况作推测,用must have been；所对现在情况作推测,用must be.比较：He must be ill. 他一定是病了.（指现在有病）He must have been ill. 他当时一定是有病 / 他一定生过病.（指过去有病）He must ...
标签：must
must be和must have的区别
have to和must的区别
Must I, Miss Sophie
You must love me
情态动词must的用法
have been to和have been有什么区别
What have I done 和 What I have done 有什么区别？
i must be you意思 是什么 大概的也行
Passwor总白难ds must match是什么意思
You must be online when log今只ging in for the first time怎么办
must be和must have的区别
have to和must的区别
Must I, Miss Sophie
You must love me
情态动词must的用法
have been to和have been有什么区别
What have I done 和 What I have done 有什么区别？
i must be you意思 是什么 大概的也行
Passwor总白难ds must match是什么意思
You must be online when log今只ging in for the first time怎么办
