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1、Wash your hands. Open the door, please. Lets go to school. Turn left. Be quiet, please. (Please be quiet.） Sit down please.,去洗你的手 请开门。 我们去电影院吧 请安静 请坐下,肯定祈使句的结构如下： Do (动词原形) sth,please.,Dont wash your hands. Dont open the door, please. Dont turn left. Dont be quiet, please. (Please be quiet.） Dont si
2、t down please.,不要洗你的手 请不要开门。 不要左转 不要安静 不要坐下,否定祈使句的结构如下： Dont do sth.,祈使句,定义 表示请求、给予命令或指示的句子叫祈使句。祈使句通常省略主语“you”，动词一律用动词原形。,表达方式,肯定结构: 1. Do型(即:动词原形(+宾语)+其它成分)。如:Please have a seat here. 请这边坐。 2. Be型(即:Be + 表语(名词或形容词)+其它成分)。如:Be a good boy! 要做一个好孩子! 3. Let型(即:Let + 宾语 + 动词原形 + 其它成分)。如:Let me help you.
3、 让我来帮你。,表达方式,否定结构: 1. Do型和Be型的否定式都是在句首加dont构成。如:Dont forget me! 不要忘记我! Dont be late for school! 上学不要迟到! 2. Let型的否定式有两种:“Dont + let + 宾语 + 动词原形 + 其它成分”和“Let + 宾语 + not + 动词原形 + 其它成分”。如:Dont let him go. / Let him not go. 别让他走。 3. 有些可用no开头,用来表示禁止性的祈使句。如:No smoking! 禁止吸烟!No fishing! 禁止钓鱼!,祈使句，无主语，只要动词就可
4、以； 表示请求或命令，加上please表客气； 如果变成否定句，Dont开头是旋律； NO talking ！是警示，祈使用法要牢记！,牢记，牢记，再牢记,记住了没？,轻松小练习,1.咱们一起玩吧 2.请不要迟到. 3.回答这个问题. 4.打开窗户,Lets play together! 2.Dont be late. 3.Answer this question. 4. Open the window,Turn left!,Guessing Game,Turn right!,Guessing Game,Guessing Game,Dont smoke! No smoking!,Guessin
5、g Game,Dont play football!,Guessing Game,Dont park your car!,Guessing Game,Dont eat!,Guessing Game,Dont pick the flowers!,Go upstairs!,Guessing Game,Guessing Game,Go downstairs!,第一关：Lets Read,Dont throw things at the monkeys.,Dont feed the animals.,Dont walk on the grass.,Dont take photographs here.
6、,Dont leave litter.,第二关Lets Say,You cant sleep on the desk.,Dont _ on the _.,You cant climb trees in the park.,Dont _.,You cant sit on the grass.,_.,sleep,desk,climb trees in the park,Dont sit on the grass,第三关 Lets Write,第四关 Play a game: Look and guess,No smoking,Dont touch,Dont eat./Dont drink.,No
7、parking,Be quiet,Lets do exercise.,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 wasting C. not to waste D. no waste 4. _ higher, and you will see the house. OK. A.
8、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,Exercises:,Lets do more exercises.,1. _ forget to write to me. A. Dont B. Please 2. _ careful! A. Be do B. Be C. Not D. Not do 3. _ let anyone open the door. A. Dont B. Will C. Not D. No,B,B,A,4. _ get off the lorry until it stops. A. Do B. Cant C. / D. Dont,