现在完成时的被动语态.ppt

1、Grammar,Passive Voice,经典题型： 1. They clean the classroom every day. 2.They cleaned the classroom yesterday. 3. They will clean the classroom tomorrow. 4. They must clean the classroom after class.,The classroom is cleaned by them every day.,The classroom was cleaned by them yesterday.,The classroom w

2、ill be cleaned by them tomorrow.,The classroom must be cleaned by them after class.,Summary: 被动语态的构成：be + done（过去分词）,、一般过去时：was done were,1.一般现在时： am is done are,3.一般将来时：will be done shall,4. 含有情态动词: can may must be done should have to,现在完成时的被动: has /have been+done,1.表示过去开始的被动动作一直持续到现在，常与之连用的时间状语有：f

3、or +一段时间，since +时间状语（从句），these days, so far, up to now, in the last / past few years等。 e.g Up to now, half of the boos have been read by the students. 2. 表示某被动动作对现在造成的影响或结果，常与already, yet, just, ever, never, recently等连用。 e.g.I have already been introduced to Mr. Smith.,一般过去时则是表示过去某时发生的动作或情况, 与现在没有关系

4、。一般过去时常与表示确定的过去时间的状语连用, 如: yesterday, two weeks ago, in 1978, 等,e.g.The machine has been repaired 机器已经修好了。 (说明动作发生在过去，对现在有影响，修好了。) The machine was repaired yesterday 机器昨天修了。(只说明动作发生在昨天。),1. 现在完成时被动语态肯定句 主语+has/ have been +动词的过去分词 Her motorbike has been stolen. 她的摩托车被盗了。 All the offices have been lin

5、ked by computer. 所有的售票处由计算机联网工作。,句型,2.They havent been told about it yet. 否定式：_+及物动词的过去分词。 3.Have his books been sold out? Yes. So you cant buy one now. 一般疑问句形式： _+及物动词的过去分词。,have / has + not + been,Have / Has +主语+ been,How many experiments have been done by the students this month? 特殊疑问句形式： 疑问词 + h

6、ave / has + been +及物动词的过去分词。,并不是所有动词都有被动语态 happen, take place, break out, belong to, cost, last等不及物动词或词组无被动语态。 误 Great changes have been taken place in China since 1978. 正 Great changes have taken place in China since 1978.,一、单项选择,1.Both my brothers work at the power station that _ in my hometown. A

7、. has set up B. has been set up C. was set up D. is set up,2.-_ the sports meet will be put off. A. Ive been told B. Ive told C. Im told D. I told,B,A,3. All the preparation for the task _, and were ready to start. A. completed B. complete C. had been completed D. have been done,D,4. - How long _ at

8、 this job? - Since 1990. A. were you employed B. have you been employed C. had you been employed D. will you be employed,B,5.When and where to go for the on-salary holiday _ yet. A. are not decided B. have not been decided C. is not being decided D. has not been decided,D,6. -Did you move into the n

9、ew house? - No. The rooms _ yet. A. were being painted B. are painting C. have not painted D. have not been painted,D,二、改错,1. A personal computer has bought by us. A personal computer has been bought by us. 2. Many problems has been found with our new computer. Many problems have been found with our

10、 new computer.,5. The computer was used every day since we bought it. The computer has been used every day since we bought it. 6. A lot of e-mails had written on the computer in the past 5 years. A lot of e-mails have been written on the computer in the past 5 years.,三、用动词正确形式填空。,1. First as a PC an

11、d then as a laptop, I _ (use) in offices and homes since the 1970s. 2. Over time my memory _ (develop) so much that, like an elephant, I never forget anything I _(told). 3. Since the 1970s many new applications _ (find) for me.,have been used,has developed,have been told,have been found,4. I have also _(put) into robots and