1. 英语中常用主动表被动的情况主要有： ①一些既是及物又是不及物的动词。如 read, write, sell, open, shut, begin, wash, wear, etc.. 此类动词常接副词作状语。 例如： The door won‘t shut. 门关不上。 The shoes wear well. 这鞋子经穿。 ②系动词 look, feel, taste, sound, smell, prove, seem, appear, etc.. 此类动词常接形容词作表语。 例如： The cloth feels soft. 这布料摸起来柔软。 The dish tastes good. 这菜味道不错。 The passive voice:

2. ③作定语的不定式。 例如： I have a lot of work to do this week. Have you got anything to say at the meeting? ④在形容词 easy, difficult, hard 等之后作状语的不定式。 例如： This question is difficult to answer. We find the man hard to get along with. ⑤ need, want, require 作 " 需要 " 时，他们后面常接主动 的 -ing 分词或被动的不定式。在这种情况下， 句子的主语必须在逻辑上是 -ing 分词的宾语。 例如： Your hair needs cutting / to be cut. The room wants cleaning / to be cleaned everyday. 比较： I need to have my hair cut. He wants to go home this afternoon.

3. ⑥用于 be worth doing 结构。 例如： The film is well worth seeing twice. The book is worth reading. 比较 worthy 用法： The book is worthy to be read. The book is worthy of being read.

4. Exercises: 1.Cleaning women in big cities usually get _______ by the hour. A. pay B. paying C. paid D. to pay 2.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 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. 5.---Do you like the material? ---Yes, it _______ very soft. A. is feeling B. felt C. feels D. is felt 6.In some parts of the world, tea _______ with milk and sugar. A. is serving B. is served C.serves D. served 7.If city noises ____from increasing, people _____shout to be heard even at the dinner table 20 years from now.. A. are not kept; will have to B. are not kept; have to C. do not keep; will have to D. do not keep; have to 8.---Have you moved into the new house? ---Not yet, the rooms _______. A. are being painted B. are painting C. are painted D. are being painting