形式

被動語態(tài)由助動詞be加及物動詞的過去分詞構(gòu)成，強調(diào)動作是由什么人或什么東西而發(fā)出時，常用介詞“by +行為發(fā)出者”，即be+done+by+行為發(fā)出者。

被動語態(tài)可用于各種時態(tài)，通過助動詞be的變化來表示：

1、一般現(xiàn)在時的被動語態(tài). am / is / are + 動詞的過去分詞Our classroom is cleaned every day.This car is made in China.

2、一般過去式的被動語態(tài): was / were + 動詞的過去分詞His desk was cleaned just now.The station was built in 1928.

3、現(xiàn)在進(jìn)行時的被動語態(tài): am / is / are + being + 動詞的過去分詞A new factory is being built in our city now.Some trees are being cut down in the park.

4、過去進(jìn)行時的被動語態(tài): was / were + being + 動詞的過去分詞A new factory was being built in our city at that time.Some babies were being looked after by Miss Chen last year.

5、一般將來時的被動語態(tài):(A) will / shall + be + 動詞的過去分詞(B) am / is / are + going to be +動詞的過去分詞.Some new factories will be built in our city this year.Your watch is going to be mended in an hour.

6、過去將來時的被動語態(tài):(1)would / should + be + 動詞的過去分詞(2)was / were +going to be + 動詞的過去分詞.She said that some new factories would be built soon in our city.He thought that your watch was going to be mended after an hour.

7、現(xiàn)在完成時的被動語態(tài):have / has + been + 動詞的過去分詞Some new factories have been built in the city since last year.Your watch has been mended already.

8、過去完成時的被動語態(tài):had + been + 動詞的過去分詞He said that some new factories had been built in the city.I didn’t know that my watch had been mended .

9、含情態(tài)動詞的被動式：can/may/must + be + done(1)You must hand in your homework after class.Your homework must be handed in after class.(2)He can write a letter with the computer.

A letter can be written with the computer by him.

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