高中英语语法——祈使句.ppt

* * * * * * Grammar Imperatives (祈使句) No smoking! Don’t drink! Attention！ Parking! What do they mean? Grammar-1. Look Say Look at the signs and say what they do. Don’t go faster than 90 kph. Turn right. Don’t walk. / No pedestrians. Don’t turn left. / No left turn. Don’t stop. / No parking They give instructions 一.祈使句的定义 用于表达命令、请求、劝告、警告、禁止等的句子叫做祈使句。 Look at the following sentences: Go and wash your hands. （去洗手。——命令） Be quiet, please.（请安静。——请求） Be kind to our sister. （对姊妹要和善。——劝告） Look out！Danger！（小心！危险！—警告） Keep off the grass. （勿践草坪。——禁止） Can you tell me what are imperatives? 定义: 祈使句无_____，主语you常______； 动词_____谓语当，句首加_____变否定； 主语 省去 原形 Don’t Are the following sentences imperative? (discuss in pairs) He is always sleeping in the class. It’s a beautiful day, isn’t it? Tell me your name, please? Will he come tonight? Mary, come here! (√) (×) (×) (×) (√) 二.祈使句的结构 1. Observation What’re the features of imperative? Listen to me carefully. Come in and sit down, please. Don’t close the window – it’s hot. Be quiet! Be a good boy! Let’s try our best to improve our environment. Listen Come sit Don’t Be Let’s Be 2. Conclusion Do 型 （以行为动词开头） Stand up! Don’t stand up! / Never stand up! Be 型 （以be动词开头） Be careful. Don’t be late./ Never be late. Let型 （以let开头） Let him in. Let me help you. ◆ 肯定结构: ◆ 否定结构: ① Do型和Be型的否定式都是在句首加don’t构成。如:不要忘记我! Don’t forget me! /Don’t be late! ② Let型的否定式有两种:“Don’t + 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:别让他走。 Don’t let him go. / Let him not go. ③ 有些可用no开头, 用来表示禁止性的祈使句。如:禁止吸烟！禁止钓鱼！ No smoking! No fishing! 用祈使句完成下列句子。 1. _____ on the pavement （人行道）. 2. _____ in the bicycle lanes. 3. ______ at red traffic lights. 4. ______ the rules of the road. Go Ride Stop Keep go, keep, look, ride, stop, stay, watch out 5. _________ for pedestrians （行人）. 6. ______ behind you before you turn right or left. 7. __________ in the middle of the road. Look Watch out Do