被动语态的基本构成：主语 + be + 及物动词的过去分词。动词的执行者由介词 by 引出，往往可以省去。被动语态是动词的一种形式，有时态、人称和数的变化，这种变化体现在助动词 be 上。英语中常用的十种被动语态如下表所示（以ask 为例）：
1.一般现在时：主语 + am/is/are + 过去分词
English is taught in most schools in china.
2.一般过去时：主语 + was/were + 过去分词
The computer was put into operation in 1942.
3.一般将来时：主语 + shall/will + be + 过去分词
The sports meet will be put off.
4.过去将来时：主语 + should/would + be + 过去分词
He said he would be loved if he loved others.
5.现在进行时：主语 + am/is/are + being + 过去分词
I'm afraid I am being followed.
6.过去进行时：主语 + was/were + being + 过去分词
The hospital was being built when I came last time.
7.现在完成时：主语 + have/has + been 过去分词
Many new buildings have been completed in the city.
8.过去完成时：主语 + had been + 过去分词
All the tickets had been sold out when they arrived.
9.将来完成时：主语 + shall/will + have been + 过去分词
The new factory will have been completed by the end of this month.
10.过去将来完成时：主语 + should/would + have been + 过去分词
He said that Book One would have been finished by the end of this term.