3. 动词不定式在名词后面作定语，不定式和名词之间有动宾关系时，又和句中另一名词或代词构成主谓关系, 不定式的主动形式表示被动含义。
例 I have a lot of things to do this afternoon． (to do与things是动宾关系，与I是主谓关系。)
试比较：I’ll go to the post office. Do you have a letter to be posted? ( 此处用不定式的被动语态作定语表明you不是post动作的执行者。)
4. 在某些“形容词＋不定式”做表语或宾语补足语的结构中，句子的主语或宾语又是动词不定式的逻辑宾语时，这时常用不定式的主动形式表达被动意义。这些形容词有nice，easy，fit，hard，difficult，important，impossible，pleasant，interesting等。
例This problem is difficult to work out .（可看作to work out省略了for me）.
5． 在too… to…结构中，不定式前面可加逻辑主语，所以应用主动形式表示被动意义。
例This book is too expensive (for me) to buy.
6. 在there be…句型中，当动词不定式修饰名词作定语时，不定式用主动式作定语，重点在人，用被动形式作定语，重点在物。
例There is no time to lose（to be lost）．（用 to lose可看成for us to lose；用to be lost，谁 lost time不明确。）
7. 在be to do结构中的一些不定式通常应用主动表主动, 被动表被动。然而,由于古英语的影响,下列动词rent,blame,let等仍用不定式的主动形式表示被动意义。
例 Who is to blame for starting the fire?
六、介词in, on, under等+名词构成介词短语表被动意义
表示方位的介词与含动作意义的名词合用，含被动之义，其意义相当于该名词相应动词的被动形式，名词前一般不用冠词。
1. “under +名词”结构，表示“某事在进行中”。常见的有：under control（受控制）, under treatment（在治疗中）, under repair（在修理中）, under discussion（在讨论中）, under construction（在施工中）。
例The building is under construction( is being constructed).
2．“beyond+名词”结构，“出乎……胜过……、范围、限度”。常见的有：beyond belief (令人难以置信)， beyond one’s reach（鞭长莫及），beyond one’s control（无法控制），beyond our hope．我们的成功始料不及。
例The rumour is beyond belief（=can’t be believed）．
3.“above+名词”结构, 表示“(品质、行为、能力等) 超过……、高于……”。
例His honest character is above all praise．=His honest character cannot be praised enough．
4．“for+名词”结构，表示 “适于……、 为着……”。如：for sale(出售), for rent（出租）等。
例That house is for sale. (= That house is to be sold).
5．“in+名词”结构 ，表示“在……过程中或范围内”常见的有：in print（在印刷中），in sight(在视野范围内)，等。
例The book is not yet in print．(=is not yet printed)
6．“on+名词”结构, 表示“在从事…… 中”。常见的有：on sale(出售)，on show（展出）, on trial（受审）。
例Today some treasures are on show in the museum (= are being showed).
7．“out of+名词”结构； 表示 “超出…… 之外“，常见的有：out of control (控制不了)，out of sight （超出视线之外），out of one’s reach(够不着), out of fashion(不流行)等。
例 The plane was out of control (can’t be controlled)． 。
8．“within+名词”结构，“在……内、不超过……”。
例He took two days off within the teacher's permission
被动语态习题
1. If city noises ____ from increasing，people ____ shout to be heard even at dinner．
A． are not kept；will have to B． are not kept；have
C． do not keep；will have to D． do not keep；have to
2. The fifth generation computers, with artificial intelligence, are ____and perfected now.
A. developed B. have developed
C. are being developed D. will have been developed
3. --- ____ the sports meet might be put off．
--- Yes，it all depends on the weather．
A． I've been told B． I've told C． I'm told D． I told
4. I need one more stamp before my collection ___.
A. has completed B. completes C. has been completed D. is completed
5. Rainforests ___ and burned at such a speed that they will disappear from the earth in the near future.
A. cut B. are cut C. are being cut D. had been cut
6. The new suspension bridge ___ by the end of last month.
A. has been designed B. had been designed
C. was designed D. would be designed
7. When a pencil is partly in a glass of water, it looks as if it ____.
A. breaks B. has broken C. was broken D. had been broken
8. Great changes ___ in the city, and a lot of factories ___.
A. have been taken place; have been set up
B. have taken place; have been set up
C. have taken place; have set up
D. were taken place; were set up
9. That suit __ over 60 dollars.
A. had costed B. costed C. is costed D. cost
10. --- Look! Everything here is under construction.
--- What’s the pretty small house that __ for?
A. is being built B. has been built C. is built D. is building
11.--- Do you like the material?
--- Yes, it ___ very soft.
A. is feeling B. felt C. feels D. is felt
12. It is difficult for a foreigner ____ Chinese．
A． write B． to write C． to be written D． written
13. I have no more letters ____ ，thank you．
A． to type B． typing C． to be typed D． typed
14. Take care! Don’t drop the ink on your shirt, for it __ easily.
A. won’t wash out B. won’t be washed out
C. isn’t washed out D. isn’t washing out
15. Nobody noticed the thief slip into the house because the lights happened to ___.
A. be put up B. give in C. be turned on D. go out
16. The computers on the table ___ Professor Smith.
A. belongs B. are belonged to C. belongs to D. belong to
17. --- What do you think of the book?
---Oh, excellent. It’s worth ___ a second time.
A. to read B. to be read C. reading D. being read
18. The squirrel was lucky that it just missed ___.
A. catching B. to be caught C. being caught D. to catch
19. This page needed ___ again.
A. being checked B. checked C. to check D. to be checked
20. ___ many times, the boy still didn’t know how to do the exercises
A. Having taught B. Having been taught C. taught D. Teaching
被动语态习题
key 1--5 ACADC 6--10 BCBDA
11--15 CBCAD 16--20 DCCDB
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