被动语态的构成1.被动语态的基本结构:be+动词过去分词2.各种时态的主动被动语态结构(以动词 do 为例)时态主动语态被动语态例句主动语态被动语态一般现在时do/ doesam/ is/ are+doneWe clean the classroom.The classroom is cleaned by us.一般过去时didwas/ were+doneHe made the kite.The kite was made by him.现在进行时am/ is/are+doingam/ is/ are+being doneShe is watering flowers.Flowers are being watered by her.现在完成时have/has+donehave/ has+been doneJim has finished the work.The work has been finished by Jim.一般将来时will/ shall/ be going to +dowill/ shall/ be going to+be doneThey will plant trees tomorrow.Trees will be planted by them tomorrow.过去进行时was/ were+doingwas/ were+being+doneShe was writing a letter this time yesterday.A letter was being written by her this time yesterday.过去完成时had+donehad+doneJim had finished the work.The work had been finished by Jim.过去将来时would/ should/ be going to+dowould/should/ be going to+doHe said he would made a kite.He said a kite would be made by him.含有情态动词 can/ may/ must+docan/may/must+be+doneI can find him.He can be found by me.(二)被动语态的用法被动语态中主语是动作的承受者,主要用于下列几种情况1.不知道动作的执行者是谁。e.g.This watch is made in China.这块手表是在中国制造的。2.没有必要指出动作的执行者是谁。e.g.More trees must be planted every year.每年必须有更多的树被种植。3.需要强调或突出动作的承受者时。e.g.Chinese is spoken by more and more people in the world.世界上越来越多的人说汉语(强调汉语的使用广泛)。4.动作的发出者不是人时。e.g.Many houses were washed away in the flood.很多房屋在洪水中被冲走了。(三)主动语态和被动语态的转换1.主动语态变被动语态: (1)要将主动句里的宾语成分变为被动句中的主语成分,若主动句中的宾语是人称代词,要将宾格变主格。 (2)把主动句中的主语变为被动句中的宾语,主格变宾格,并由 by 引导。 (3)谓语动词变成相应...