where have they been?是现在完成时吗?
Where have they been?
They can't have been doing thier homework.have been 是现在完成时,但
where have you been的答句用现在完成时还是过去式?【急,
Where have they been?怎样回答?
现在完成时的问题,可以用一般过去时回答吗?例:where have you been? i've been to the
现在完成时的问题,-Where have you been?-I have been to
关于现在完成时have been
现在完成时的have been
They have been actually using farming practices where they a
Any idea where they may have been made
have done是现在完成时 have been done 是不是现在完成时的被动吖
当句子是现在完成时的时候,是用have been还是had been,有什么区别吗