語的被動語態中，不管什麼時候都必須要用be動詞，一般現在時被動語態be要根據人稱變成am， is 或者are。過去時be要變成was 或者were。現在完成時be要變成have或has been。
被動語態的構成是be+過去分詞，其中be要根據具體的時態變化。
如果用於現在完成時和過去完成時，be要變成have/had been，再加被動語態
如果be在情態動詞後面，可以保持be的原形
This can be predicted. 這是可以預見到的。
All the problems have been solved. 所有的問題都解決了。
一般地講，被動語態可用於英語的各種時態。爲了能準確地運用被動語態，重點是要掌握be動詞的各種時態變化。各種時態的被動語態舉例如下：
1、 一般現在時的被動語態. 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: was / were + 動詞的過去分詞
His desk was cleaned just now.
The station was built in 1928.
3、現在進行時的被動語態: 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、過去進行時的被動語態: 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:
(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: (1)d / should + be + 動詞的過去分詞 (2) / 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、現在完成時的被動語態: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: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、含情態動詞的被動式：can/may/must + be + done
例如：He can not be found. / I must be paid for this.
