Grammar Focus new.ppt

1、Unit 7,Section A Grammar Focus,I think students should be allowed to do homework with friends. Sixteen-year-olds should not be allowed to drive. Do you think sixteen-year-olds should be allowed to choose their own clothes?,Look at these sentences.,情态动词的被动语态,肯定句: 主语+ 情态动词+be+ 动词过去分词. 否定句: 主语+情态动词+not

2、+ be+动词过去分词. 疑问句: 情态动词+ 主语+ be+ 动词过去分词?,(一)将主动语态的宾语变成被动语态的主语。 (二)将含情态动词的主动句式变成被动句式，即：“情态动词+动词原形”变成“情态动词+be+过去分词”，然后再在其后加“by+主动句中的主语(人称代词用宾格)”。by短语也可省略。 请看下列各句：,转变方法,You should finish your homework first. Your homework should be finished (by you) first. You can take this magazine home. This magazine

3、can be taken home (by you).,含情态动词的疑问句、否定句的变化均需借助于情态动词完成。 1. 一般疑问句：直接将被动语态的陈述句中的情态动词提前。 Must this task be finished at once? 这项任务必须立即完成吗？,句式变换,注意：含情态动词的被动语态的一般疑问句的回答，应保留原情态动词，但must表“必须”时，其否定回答应用neednt；need表“必要”时，其肯定回答应用must。如： - Must my exercise book be handed in now? 我的练习本必须现在上交吗？ - Yes, it must. 是的，

4、必须现在上交。 （No, it neednt. 不，不必现在上交。） - Need he be operated on at once? 他必须立即手术吗？ - Yes, he must. 是的，他必须。 （No, he neednt. 不，他不必。）,2. 特殊疑问句 ：由特殊疑问词加上被动语态的一般疑问句构成。 When must this task be finished? 这项任务必须在什么时候完成？ 3. 否定句： 在情态动词后面加上not或never即可，但must表必要时否定式为neednt。 This task neednt be finished at once. 这项任务没

5、必要立即完成。,4. 反意疑问句：借助情态动词构成附加疑问部分。如： This bridge can be built next year, cant it? 这座桥明年能建成，是吗？,Teenagers should be allowed to choose their own clothes. 青少年应该被允许选择他们自己的服装。 Students should not be allowed to have part-time jobs. 学生们不应该允许做兼职工作。 Can these books be taken out of the reading room? 可以把这些书带出阅览室

6、吗？ When must the work be finished? 这些工作必须什么时候完成？,Young trees should _ every year. A. be planted B. planted C. plant . 按要求完成下列各句每空一词含缩写。 1. We must do the work right now. (改为被动语态) _ _ _ _ _ right now.,A,The work must be done,. 选择最佳答案。,2. Teenagers should be allowed to go out with their friends on sch

7、ool nights. (改为否定句 ) Teenagers _ _ _ to go out with their friends on school nights. 3. A book should be read each month. (改为一般疑问句) _ _ _ _ _ each month?,shouldnt be allowed,Should a book be read,【2011天津】39. Today a lot of information can _ online. A. receive B. be received C. is received D. receivin

8、g 答案：B 【解析】 被动语态。今天有很多信息能在网上收到，信息被收到要用被动语态。含有情态动词的被动语态的构成：情态动词+be +过去分词。,中考链接,【2011浙江金华】22.Must we clean the classroom now? No, you neednt. It_ after school. A. may clean B. must clean C. need be cleaned D. can be cleaned 答案：D 【解析】由句意可知it指classroom，it和clean为被动关系，所以用被动语态，含有情态动词的被动语态结构为“情态动词+be+动词过去分词

9、”。排除A和B。need意为“需要”，can意为“可能，可以”。由句意“我们必须现在就打扫教室吗？不，不必要。可以放学打扫”可知, 故选D。,【2013山东青岛】 The song reminds me of my old school days as soon as it _. A. is played B. plays C. will be played D. will play 答案： A 【解析】考查被动语态的用法。句意：这首歌被播放的时候，使我想起了我的学生时代。it作play的承受者，故用被动语态。,【2013浙江宁波】Have you finished your project?

10、 Not yet. Ill finish it if I _ ten more minutes. A. give B. am given C. will give D. will be given 答案：B 【解析】考查动词的被动语态。句意“如果再给我十分钟我会完成它。”主语与动词give之间是被动关系，在条件状语从句中用一般现在时表将来。,【2013福建泉州】 If we take a shower instead of bath, more water _. I agree with you. A. has saved B. can save C. can be saved 答案： C 【

11、解析】考查被动语态。句意：如果我们用淋浴而不是在浴缸里沐浴的话，会节省更多的水。我赞同你的看法。情态动词的被动语态的构成是：情态动词+be +动词的过去分词。,1. Their work must _ (finish) by four oclock. 2. Your homework should _ (do) by yourself. 3. These books mustnt _ (take) out of the reading room. 4. Should these food _ (keep) dry?,be finished,be done,be taken,be kept,用所

12、给词的适当形式填空。,. 句型转换 1. You should make up the bed every day. (改为被动语态) The bed _ _ _ up every day. 2. We cant see stars in the day time. (改为被动语态) Stars _ _ _ in the day time. 3. You must return the book on time. (改为一般疑问句) _ the book _ _ on time?,should be made,cant be seen,Must,be returned,2. Parents s

13、hould encourage teenagers to do social work for their community. 3. Do you think Lucys parents might allow her to go to the party?,Teenagers should be encouraged to do social work for their community.,Do you think Lucy might be allowed by her parents to go to the party?,4a Rewrite the sentences acco

14、rding to the example.,4. Do you think we must keep teenagers away from the Internet? 5. Parents should give teenagers chances to make their own decisions.,Do you think teenagers must be kept away from the Internet?,Teenagers should be given chances by parents to make their own decisions.,The keys,be

15、 asked,are allowed,4b Fill in the blanks with the correct forms of the words in brackets.,be educated,start,move,take,continue,翻译下列句子。 1. 青少年需要被好好地教育。 _ 2. 这辆小汽车不能修了。 _ 3. 这封信必须现在寄出去吗？ _ 4. 会议应该在哪举行？ _,Teenagers need to be educated well.,This car cant be repaired.,Must this letter be posted now?,Whe

16、re should the meeting be held?,1.You must give back the dictionary before Friday.(改为被动语态) The dictionary must _ _ back before Friday. 2. He should be told about the meeting.(改为一般疑问句) _ he _ told about the meeting?,按要求完成句子。(每空一词),be given,Should be,3. The machine can be used for washing dishes.(对画线部分

17、进行提问) _ _ the machine _ used for?,What can be,4. 你可以参加补考。 You can _ _ _ later. 5. 这项工作必须按时完成。 The work must _ _ on time. 6. 青少年应被允许发展自己的爱好。 Teenagers _ _ _ to practice their hobbies.,take the test,be finished,should be allowed,What rules should an English club have? Make a list of rules for it.,Free Talk,Sample Dialogue 1 A: Members should be allo