He must have been away 哪个是情态动词 是must还是have
He must have been away 哪个是情态动词 是must还是have
情态动词后面加动词原形,为什么还可以是 he must have been away ,
不是must做情态动词对过去推测用must have done,又是进行时,用must have
情态动词can,have to,must用法
must是情态动词吗?
He must have been ill,___ he?
have 是助动词还是情态动词?
He must have been的用法.
he must have been there before-----
He must have been asleep at that time,(wasn't) he?为什么是用 wasn
关于must have been
MUST have been done