被动语态的构成
一般现在时：am／is／are＋过去分词
一般过去时：was／were＋过去分词
一般将来时：will／shall be＋过去分词
现在进行时：am／is／are being＋过去分词
过去进行时：have／has been＋过去分词
现在完成时：have／has been＋过去分词
歌诀是：被动语态be字变,过去分词跟后面.
Chinese was studied by Cranny last night.
The city wasn't visited by us last week.
Whose ruler was borrowed by you?
It may be taken back by you.
Can you mind was radioed here?