9.主动句“s. + v. + n. + to-inf” 中的动词,变成被动语态后,原来作宾补的to不定式成了主语的补足语:
In that country nobody is allowed to capture or kill tigers without government's permission. 在那个国家,任何人未经政府批准都不得捕捉或杀死老虎。
Children are encouraged to develop their creative abilities. 孩子发展创造力受到鼓励。
有时候,谓语动词和不定式都用被动语态,这就是所谓双重被动式:
This book is required to be published in time. 这书必须及时出版。
Only a handful of his many compositions was allowed to be pub-lished during his lifetime. 在他生前,他的许多作品中只有一小部分允许出版。
bear， beseech(恳求),cause， decide， get， hate， like， love， prefer， want， wish， trouble 等用于本句型时没有被动语态。
而calculate， think， say 用于本句型，只用被动语态:
This advertisement is calculated to attract the attention of house-wives. 这个广告是为了引起家庭主妇们的注意而设计的。
In January of 1958 the Triangle was said to have swallowed up the yacht Revonc with its owner and crew. 1958年1月,据说三角带吞没了“雷沃纳克号”游艇,船主和船员全部遇难。
The arrival of the cinema was once thought to proclaim the death of the theater. 电影院的出现,曾经一度被认为宣告了戏院的消亡。
believe， find ， imagine 和suppose 主要用于被动语态:
The book was found to have been rewritten. 这书发现被改写过。
Students are not supposed to smoke in the classroom. 学生不允许在教室里抽烟。
10.在句型“s. + v. + n. +bare inf.”中的动词,有些可用于被动语态;变成被动语态后,原来作宾补的不带to的不定式,变成带to不定式作主语的补足语:
When an electric field is set up， all the free electrons will be made to move in one direction. 当建立起一个电场时,全部自由电子都会朝一个方向运动。
He was never heard to sing a song. 没有人听见过他唱歌。
The thief was seen to steal into the house. 有人看见那贼溜进房子里。
