Unit 10 Water Festival --祈使句.ppt

1、Unit 10 Water Festival 祈使句,Go upstairs!,Be quiet!,Dont litter！,No cameras!,Dont smoke! No smoking!,祈使句的特点,定义：用于提出请求，发出邀请，给予提示，忠告或警告。也可指发出命令等。 特点： 1.主语一般为第二人称，但一般不出现主语（you），有时，为指明向谁请求或命令，也可以说出主语。 2.谓语动词一律用原形，否定式一律在动词前加dont。,一、祈使句的谓语总是用动词原形,1.Be quiet! 安静！ 2.Come earlier next time.下次早点来。 3.Have a good

2、 time. 愿你玩的愉快。 4.Go and tell her.去告诉她吧。 有时为了加强语气可在动词前加 do。 Do be careful.务必小心。 Do come on time.务必请准时来。,二、祈使句的否定式,构成方法：在动词前加 dont，或者never。 1.Dont be late again.= Never be late again. 2.Dont speak so loud. 3.Dont walk on the grass.,三、与 please 连用以使语气委婉,为使语气委婉，通常将祈使句与please连用。 Please可用于祈使句的句首，（其后通常不用逗号）

3、或句末（其前通常用逗号）如： 1.Please dont get angry. 2.Please drive more slowly. 3.Please be quiet. 4.Remember to telephone, please.,四、关于以 let 开头的祈使句,Let me have a try. Let me show you. Let every man do his best. 让每个人人尽奇才。 注意： 1.这类祈使句的否定有两种形式。如： Lets not hurry./ Dont lets hurry.,五、以 no 开头的祈使句,No + v-ing /noun (名

4、词)表示禁止： No smoking. No parking. No photos.,Be quiet, please. （请安静。请求） No smoking!(请勿吸烟。劝告） No parking. (禁止停车。禁止） Keep off the grass. （勿践草坪。禁止） Dont litter.（不要乱扔垃圾。劝告） Turn left!（向左转弯。命令）,Practice,1.不要哭。 2.孩子们，请安静！ 3.请走这边。 4. 举手。 5.不要在马上上玩耍。 6.我们共进晚餐吧。 7.立正！ 8.不准吸烟。,Please be quiet, boys!,Dont cry.,C

5、ome this way, please.,Put up your hands.,Dont play on the road.,Lets have dinner together.,Attention!,No smoking.,1. Jim, _ me a hand. A. gives B. is giving C. will give D. give 2. _ careful, Jenny! There is a tree in front of you. A. Am B. / C. Be D. Was 3. Lets _ our time. A. not waste B. no wasti

6、ng C. not to waste D. no waste 4. _ higher, and you will see the house. OK. A. If you stand B. To stand C. When you stand D. Stand,Exercises:,5. Please _ do it. A. he B. let him C. let he D. him 6. _ let anyone open the door. A. Dont B. Will C. Not D. No 7. Dont be late again. Sorry, _. A. I may B. I must C. I will D