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!,祈使句的特點,定義：用于提出請求，發(fā)出邀請，給予提示，忠告或警告。也可指發(fā)出命令等。 特點： 1.主語一般為第二人稱，但一般不出現(xiàn)主語（you），有時，為指明向誰請求或命令，也可以說出主語。 2.謂語動詞一律用原形，否定式一律在動詞前加dont。,一、祈使句的謂語總是用動詞原形,1.Be quiet! 安靜！ 2.Come earlier next time.下次早點來。 3.Have a good

2、 time. 愿你玩的愉快。 4.Go and tell her.去告訴她吧。 有時為了加強語氣可在動詞前加 do。 Do be careful.務(wù)必小心。 Do come on time.務(wù)必請準時來。,二、祈使句的否定式,構(gòu)成方法：在動詞前加 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、與 please 連用以使語氣委婉,為使語氣委婉，通常將祈使句與please連用。 Please可用于祈使句的句首，（其后通常不用逗號）

3、或句末（其前通常用逗號）如： 1.Please dont get angry. 2.Please drive more slowly. 3.Please be quiet. 4.Remember to telephone, please.,四、關(guān)于以 let 開頭的祈使句,Let me have a try. Let me show you. Let every man do his best. 讓每個人人盡奇才。 注意： 1.這類祈使句的否定有兩種形式。如： Lets not hurry./ Dont lets hurry.,五、以 no 開頭的祈使句,No + v-ing /noun (名

4、詞)表示禁止： No smoking. No parking. No photos.,Be quiet, please. （請安靜。請求） No smoking!(請勿吸煙。勸告） No parking. (禁止停車。禁止） Keep off the grass. （勿踐草坪。禁止） Dont litter.（不要亂扔垃圾。勸告） Turn left!（向左轉(zhuǎn)彎。命令）,Practice,1.不要哭。 2.孩子們，請安靜！ 3.請走這邊。 4. 舉手。 5.不要在馬上上玩耍。 6.我們共進晚餐吧。 7.立正！ 8.不準吸煙。,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