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被动语态结构
助动词be+及物动词的过去分词；情态动词+be+及物动词的过去分词。被动语态是动词的一种形式，用以说明主语与谓语动词之间的关系。
被动语态的用法
1.一般现在时的被动语态构成：is / am / are + 及物动词的过去分词
Our classroom is cleaned everyday. 我们教室每天都被打扫。
I am asked to study hard. 我被告知要努力学习。
Knives are used for cutting things. 刀是用来切东西的。
2.一般过去时的被动语态构成：was / were + 及物动词的过去分词
A new shop was built last year. 去年修了一座新商店。
Dinosaur eggs were laid long long ago. 恐龙蛋被放置了很久很久。
3.一般将来时的被动语态构成：will+ be + 及物动词的过去分词
A new hospital will be built in our city. 我们城市将要修建一家新医院。
Many more trees will be planted next year. 明年会种更多的树。
4.现在进行时的被动语态构成：am / is / are + being + 及物动词的过去分词
Uncle Wang is mending my bike now.→
My bike is being repaired by Tom now. 王叔叔正在修理我的自行车。
They are planting trees over there. →
Trees are being planted over there by them. 他们在那里种植的树木。
5.现在完成时的被动语态构成：has / have + been + 及物动词的过去分词
This book has been translated into many languages. 这本书被翻译成多种文字。
Many man-made satellites have been sent up into space by many countries. 在许多国家有许多人造卫星被送上了太空。
6.过去进行时的被动语态构成：was/were + being + 及物动词的过去分词
The boy was being operated on when his parents hurried to the hospital.当他的父母赶到医院的时候...