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1、表命令表命令, 请求请求, 建议建议, 劝告的句子叫祈使句。劝告的句子叫祈使句。可分为第二人称祈使句和第一、三人称祈可分为第二人称祈使句和第一、三人称祈使句使句。主语为主语为you, 常省略常省略, 谓语动词用原谓语动词用原形形, 句末用感叹号或句号句末用感叹号或句号。主语为第一、主语为第一、三人称句子结构三人称句子结构: Let + 动词原形动词原形+其他成其他成分或分或Lets + 动词原形动词原形 + 其他成分其他成分。 主语为第二人称：主语为第二人称：e.g. Switch off the motor. Follow the rules of the road. Dont leave
2、the light on.主语为第一主语为第一, 三人称：三人称：e.g. Let me see. Let her come here at eight oclock. Let us help you tidy your room. Lets have a break.1. 祈使句的否定式祈使句的否定式: 第二人称祈使句一般在句首加第二人称祈使句一般在句首加dont; 第一人称祈使句一般在人称代词后加第一人称祈使句一般在人称代词后加not; 第三第三人称祈使句一般在句首加人称祈使句一般在句首加dont 。 有时有时为了加强祈使句为了加强祈使句的语气的语气, 可以在谓语可以在谓语动词前加动词前加
3、do。e.g. Dont be late again. Dont let her be alone. Let us not talk of that matter. Do study hard at school. 2. 加强祈使句的语气：加强祈使句的语气： 有时为使语气更委婉有时为使语气更委婉, 可用可用Will / Would / Could you + 动词原形、在句末加动词原形、在句末加please、在句末加、在句末加will you / shall we，Why not / Why dont you + 动词原动词原形、形、Youd better + 动词原形、动词原形、 I sug
4、gest .等。等。e.g. Would you come to dinner with me tonight? 3. 祈使句表祝愿的方式：祈使句表祝愿的方式：e.g. Success to you! Wish you a good journey. May you have a happy marriage. Heres to your success! Allow me to propose a toast to our friendship! 4. 含含let 的祈使句的祈使句: Let somebody v./adv. e.g. Lets be friends. Let me have
5、 a try, will you? Let him in, please. 5. 不用动词开头的祈使句：不用动词开头的祈使句：e.g. To pumps, every one of you! To the airport, taxi! Down with the pens! No smoking! No spitting! No litter!Look at the signs and say what they do.Turn right.Dont go faster than 100 kph.Dont turn left.No parking.Dont walk.1. They give
6、advice.2. They give instructions.3. They give information.4. They give permission.Read these dos and donts for motorists stuck in a traffic jam. Tick the ones you agree with.DosSwitch off the motor.Turn on the car radio.Speak to your passengers.Follow the rules of the road.Keep cool.DontsLeave the m
7、otor on. Blow your horn.React when others drive badly.Break the rules of the road.Get angry.Complete the following sentences. 1. _ on the pavement. 2. _ in the bicycle lanes. 3. _ at red traffic lights. 4. _ the rules of the road. Dont go Stay Stop Keep break go keep look ride stop stay watch out 5.
8、 _ for pedestrians. 6. _ behind you before you turn right or left. 7. _ in the middle of the road. Look Watch out Dont ride1. Stand over there _ youll be able to see it better. A. or B. while C. but D. and 2. Ive never seen anyone run so fast - _ David go. A. just watch B. just to watch C. just watc
9、hing D. just having watchedDAChoose the correct answers.3. Let us pass, _? A. shant we B. shall we C. wont we D. will you 4. Wait a minute, _? A. shall you B. will you C. do you D. dont you DB5. Alice, you feed the bird today, _? But I fed it yesterday. A. do you B. will you C. didnt you D. dont you
10、 本题中本题中Alice 并不是句子的主语并不是句子的主语, 而是祈而是祈使句使句, 为了引起对方的注意。为了引起对方的注意。6. _ down the radiothe babys asleep in the next room. A. Turning B. Turned C. Turn D. To turn 祈使句以动词原形开头。祈使句以动词原形开头。7. How about a film tonight? _ I havent been to the cinema for a long time. A. Yes, thanks B. Why not? C. No, go away D.
11、Its a pity. 8. Youd better not smoke here, _? A. will you B. shall you C. have you D. had you 有有had better 的句子构成反意疑问句的句子构成反意疑问句, 用用had 构成。构成。9. Dont forget to phone me, _? A. do you B. neednt you C. wont you D. will you 否定祈使句的反意疑问句用否定祈使句的反意疑问句用will 构成。构成。10. Lets have a cup of tea, _? A. shall you B. will you C. shall we D. wont you 以以lets 开头的祈使句用开头的祈使句用shall we, 以以let us开头的祈使句用开头的祈使句用will you, 构成反意构成反意疑问句。疑问句。Finish the exercises 1-3 on page 73.