Unit  3   Tomorrw’s world
Section  Ⅳ  Grammar & Writing
语法讲座
写作讲座
知识必备
专题练习
佳作观摩
技法指导
专题练习
被动语态
一、被动语态的概念及构成
1．被动语态的概念
      被动语态表示主语是谓语动作的承受者。动作
      的执行者通常由介词by引出。
      He was scolded by his mother for breaking the
      cup.
      他因打破杯子而被妈妈训斥了。
2．被动语态各种时态的构成
Books in the library are not allowed to be taken out without permission.
图书馆的书未经允许不许带出。
The 41st World Expo was successfully held in Shanghai in 2010.
第41届世博会于2010年在上海成功举办。
I shall be given a chance to play in this game again.
我将获得再一次进行比赛的机会。
He found his umbrella had been taken away when he returned.
当他回来时，他发现自己的雨伞已经被人拿走了。
He hoped the thief would be punished as soon as possible.
他希望尽早地惩罚这个小偷。