只要看到,be done 多半是被动语态,但是被动语态也分很多时态.一般而言,都是时态+被动语态,举几个例子
如过去时的结构是did或者was/were,所以过去时的被动语态是was/were done,这里的be 变成was/were
I cleaned the table yesterday------变成the table was cleaned by me yesterday.
又如现在完成时的结构是have/has+done,根据时态加被动,现在完成时的被动语态是have/has +been +done,这里be变成been
I have cleaned the table -----变成the table has been cleaned by me
又如一般将来时的结构是will/shall+do,所以一般将来时的被动语态结构是will/shall+be done
I will clean the table tomorrow------变成the table will be cleaned by me tomorrow
逐次类推,你会发现规律就是我上文说的时态结构+被动语态,这里的+并不是单纯相加,而是结合,他们的镶嵌点就是这个be
