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被动语态的用法
（1）当不知道或没有必要指出谁是动作的执行者 时
Such books are written for children.
这些书是为儿童写的。
（2）强调动作的承受者，这时应用by短语。
The cup was broken by David.
（3）作客观说明时，常采用一种被动语态句型.
It’s said / reported / + that …据说/据报道
It’s reported that it will rain tomorrow.
据报道，明天会下雨。
各种时态的被动语态
一般现在时
一般过去时
一般将来时
现在进行时
现在完成时
情态动词
1.一般现在时的被动语态结构：
is/are+过去分词
1.Many students study English.
English is studied by many students
2.They make shoes in that factory.
Shoesare made by them in that factory
They built the tall building last year.
He took good care of his little brother yesterday.
We cleaned our classroom just now.
They used the rooms for resting.
The tall building was built by them last year.
His little brother was taken good care of by him yesterday.
Our classroom was cleaned by us just now.