Section Ⅳ　Grammar & Writing

　　被动语态

　　阅读下列句子，体会黑体部分的用法

　　1．Men were not allowed to wear masks at night.

　　2．If they broke the laws，they were put into prison.

　　3．Today，carnival in Venice is celebrated for five days in February.

　　4．The party will be held in five days.

　　5．Two hundred trees have been planted since the man came here.

　　6．Hotels are fully booked and the narrow streets are crowded with wonderful costumes.

　　一、被动语态的构成

　　被动语态可用于各种时态，其时态变化通过系动词be的不同形式来体现。

时态 动词的被动形式 例句 一般现在时 am/is/are done He is asked to do this. 一般过去时 was/were done The story was told by her mother. 一般将来时 will be done The problem will be discussed tomorrow. 现在进行时 am/is/are

being done The bridge is being built. 过去进行时 was/were

being done At that time the desk was being repaired. 现在完成时 have/has

been done The house has been built. 过去完成时 had been done They said that their work had been finished. 过去将来时 would be done He said the trees would be planted soon.