被动语态由“助动词be+及物动词的过去分词”构成。人称、数和时态的变化是通过be的变化表现出来的。
一般现在时:am/is/are+done
一般过去时:was/were+done
一般将来时:will/shall
be+done
过去将来时:
would
be+done
现在进行时:am/is/are
being+done
过去进行时:have/has
been+done
现在完成时:have/has
been+done
过去完成时:
had
been+done
歌诀是:被动语态be字变,过去分词跟后面。