一般现在时:am/is/are+done
一般过去时:
一般将来时:
过去将来时:
现在进行时:
过去进行时:
现在完成时:
过去完成时:
被动语态的构成
was/were+done
will/shall be+done
am/is/are going to be + done
am/is/are to be + done
would be+done
am/is/are being+done
was / were being+ done
have/has been+done
had been + done