6.　　 某些句子习惯上用被动语态。

He was born in October, 1988.

5.　　 汉语中没有“被”、“由”等词，而在原句中试加这类词且句意通顺时。

These songs are usually sung by boys.

4.　　 汉语中含有“被”、“由”等词时。

Wei Hua is asked to come by Lin Tao.

3.　　 汉语含有“据说”、“有人说”等时。

It is said that another bridge has been built over the Changjiang River.

2.　　 不易找到或根本就找不到动作的执行者时。

My bike was stolen.

1.　　 行为主体不明确，不必说出或者无法说出动作的执行者时。

Football is played all over the world.

方 式 时　 间	一　 般	进　 行	完　 成
现　 在	am is　　　 + pp. are	am is　 　being + pp. are	has 　　　 been + pp. have
过　 去	was 　　　 + pp.　　　 were	was 　　　 being + pp. were	had been + pp.
将　 来	shall 　　　 be + pp. will
过　 去 将　 来	should 　　　 be + pp. would

The formations of the passive voices of modal verbs(B):

must/can/ may/should + be + pp.

Active Voice 主动语态　　　　　　　　　　　　　 Passive Voice

Many people speak English.　　　　　　　　 English is spoken by many people.

They found the dinosaur eggs in Liaoning.　 The dinosaur eggs were found in Liaoning.

We must do something to stop the pollution.　　 Something must be done to stop

　　　　　　　　　　　　　　　　　　　　 the pollution.

Ⅰ.The Passive Voice

5. I 　　　　　　　　　　　　　　　　　　(正要入睡) when there was a loud knock at the door. (2000新疆)

Part B　 Voices