(错) Please seat. (对) Please be seated.
要想正确地使用被动语态，就须注意哪些动词是及物的，哪些是不及物的。特别是一词多义的动词往往有两种用法。解决这一问题唯有在学习过程中多留意积累。 2) 不能用于被动语态的及物动词或动词短语：
fit, have, hold, marry, own, wish, cost, notice, watch agree with, arrive at / in, shake hands with, succeed in, suffer from, happen to, take part in, walk into, belong to This key just fits the lock.
Your story agrees with what had already been heard.
3) 系动词无被动语态： appear, be become, fall, feel, get, grow, keep, look, remain, seem, smell, sound, stay, taste, turn . It sounds good.
4) 带同源宾语的及物动词，反身代词，相互代词，不能用于被动语态： die, death, dream, live, life .
She dreamed a bad dream last night.
5) 当宾语是不定式时，很少用于被动语态。 (对) She likes to swim. (错) To swim is liked by her. 二、复习时需要注意的要点
（1）由主动语态改为被动语态的步骤：
①主动语态中的宾语变为被动语态句中的主语； ②主动语态句中的动词改为相应的被动语态； ③主动语态句中的主语变为被动语态句中by的宾语。
（2）主动语态句中的谓语动词带有双宾语，即直接宾语和间接宾语时，转换方法有两种：①把间接宾语转化为主语，保留直接宾语
②把直接宾语转化为主语，保留间接宾语。此时，一般需在间接宾语前加适当的介词。
（3）在短语see sb. do sth. 中，动词see后跟不带to的不定式作宾补。改为被动语态时要加上to。用于这一结构的谓语动词一般是表示知觉的动词如see, hear等，以及使役动词make, let等。 各种时态的被动语态举例
1．一般现在时（am/ is/ are +done）
English is spoken by lots of people in the world. 世界上的许多人都说英语。 Class meeting is held every Thursday. 每周四都举行班会。
The classroom is cleaned by the students every day. 学生们每天都打扫教室。 2．一般过去时(was/ were +done)
The cup was broken by the boy. 杯子被那个男孩打碎了。 He was saved at last. 他最终获救了。 My bike was stolen. 我的自行车被偷了。
3．一般将来时与过去将来时(will/ shall be +done; would/should be +done) A speech will be given this afternoon. 今天下午有一个演讲。 A new road will be built next year. 明年要修一条新马路。
I thought thousands of people would be helped. 我认为将有数千人得到帮助。
4．现在进行时与过去进行时(am/ is/ are being +done; was/ were being +done) The machine was being repaired at this time yesterday. 昨天这时,机器正在被修理。
The problem is being discussed now. 问题正在被讨论。
A bus is being pushed by the passengers. 路人正在推一辆公共汽车。 5．现在完成时(have/ has been + done)
Two hundred trees have been planted by now. 到现在为止,已经种了二百棵树了。
The book has been read many times by me. 这本书已经被我读了许多遍了。 Several soldiers have already been killed in the conflict. 在冲突中已经有几名士兵被杀害。
6．过去完成时(had been+done)
They said they had been invited to the party. 他们说已经被邀请参加晚会了。 She found the house had been destroyed by the storm. 她发现房子已经被暴风雨摧毁。
He had been tortured by the illness for many years before he died. 他在去世前已经被疾病折磨很多年了 第三节 巩固练习
Ⅰ.把下列主动语态改为被动语态:
1． We often use a recorder in our English class.
2． They will show a new film next week. 3． When did they build the house? 4． I saw the boy enter the room. 5． Will they show a new film next week? 6． Have they posted the letter yet? 7． We often see him help his classmate.
8． You must turn off the light before you go to be.d 9． Who is repairing the bike?
10． The student should learn all the texts by heart. Ⅱ.选择填空:
1. The reading room ________ yesterday afternoon.
A. cleaned B. is cleaned C. was cleaning D. was cleaned 2. The workers were made ________ ten hours a day. A. work B. to work C. working D. worked 3. Food ________ in a cool place in summer.
A. must keep B. mustn’t keep C. must be kept D. mustn’t be kept 4. His father ________ to work in Hong Kong 3 years ago. A. sent B. was sent C. has sent D. has been sent 5. The pen ________ well.
A. writes B. is written C. was written D. writing 6. Great changes ________ in the town since 1988. A. have taken place B. have been taken place
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