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二、被动语态下be的时态变化
常见的被动语态形式如下（以teach为例）：
(1)一般现在时： __________ + taught
(2)一般过去时： __________ + taught
(3)一般将来时：will/shall + _____ + taught
(4)现在完成时：have/has + _____ + taught
(5)含有情态动词：情态动词 + _____ + taught
was/were
be
been
am/is/are
be
They make shoes in that factory.
主语+及物动词+宾语
Shoes are made (by them) in that factory.
一般现在时：主语+am/is /are +过去分词
三、主动语态变为被动语态
They bought ten computers last term．
Ten computers were bought (by them) last term.
一般过去时：主语+was/were +过去分词
Tom will clean the room tomorrow．
The room will be cleaned (by Tom) tomorrow.
一般将来时：主语+will be+过去分词
The workers have built the bridge.
The bridge has been built (by the workers).
现在完成时：主语+have/has been+过去分词
You can do the work all by yourself.
The work _____ _____ _____ all by yourself.
We must plant more trees.
More trees _____ _____ ________.