Unit 4 Do it yourself 语法知识点暑期预习讲义 牛津译林版八年级英语上册

暑期预习—Unit 4 Do it yourself 语法点： 祈使句 祈使句是用来表示请求、命令、劝告、建议或叮嘱的句子。 Be quiet，please! Don’t be late again! 1．祈使句的主语一般是第二人称you，但往往省略。 2．祈使句的肯定形式以动词原形开头，祈使句的末尾用句号或感叹号。 Be careful，or you’ll make mistakes． Put on your coat，my dear son! 3．祈使句的否定形式一般是在动词原形前加don’t，构成“Don’t+动词原形+其他”结构。 Don’t be late for the meeting! Don’t open the window．It’s too cold outside． 4．为了显得更为客气和礼貌，常在祈使句中加please。当please放在句末时，须用逗号与其余部分隔开。 Please pass me the ball． Open the window，please． 5. 基本结构： 肯定句式主要有三种形式： ①Do型 (行为动词原形+其他) Sit down! ②Be型 (Be+表语，如名词、形容词) Be quiet! ③Let型 (Let+人称代词宾格+动词原形+其他成分) Let me help you. 用should和had better提建议 should和had better都是情态动词，都可以用于给他人提建议，表示“应该”或“最好”做某事。 1．should表“建议” (1)should意为“应该”，后跟动词原形，没有人称和数的变化，由时间状语或上下文来决定现在、过去或将来。 You should do your homework more carefully． He should be back in three days． (2)should的否定形式是should not或shouldn’t；疑问式是将should提到句子开头；反意疑问部分应为“should／shouldn’t+主语”。 一You shouldn’t come here alone again． 一 Should we discuss it at once 一Yes，you should． You shouldn’t make noise in class，should you 2．had better表“建议” (1)had better可缩写为’d better，后跟动词原形，表示现在或将来，没有人称和数的变化。 You’d better clean your room every day． (2)had better的否定形式是had better not；疑问式是将had放在主语之前；在反意疑问句中，反意疑问部分用“had／hadn’t+主语”。 We’d better riot stay at home． You’d better come to see me，hadn’t you 同步练习 一、根据句意、汉语释义和首字母写出单词 1. Don't touch the dog. It may be d_____ . 2. Your bike is b_____ . You'd better ask someone to repair it. 3. The twin brothers _____ (切) the watermelon in halves to share it. 4. Write down these _____ (句子) on the blackboard and read them. 5. You'd better c_____ the work in a week. 6. Be careful with the wet p_____ on the wall. 7. Look at the _____ (封面) of the book. How beautiful it is ! 8. He cut out some pieces of paper and then _____ (粘住) them together. 1.dangerous 2. broken 3.cut 4.sentences 5.complete 6.paint 7. cover 8.stuck 二、用方框中所给单词和词组的适当形式填空 find out had better a hand at all tool again repair instruction Andy: Dad, there is something wrong with the remote control (遥控器) . Can you 1. _____ it Dad: My hands are full now. Can you do it yourself You can read the 2. _____ first. Andy: I am reading them, but I can't 3. _____ what the problem is. Dad, please! Dad: Really Thank you 4. _____ change the batteries first. Two new AA batteries. Andy: Yes. I am changing them. Now, what should I do next Dad: Turn it on. Maybe it will work 5. _____ . Andy: No. It doesn't work 6. _____. Do I need to open the remote control Dad: You can have a try. By the way, do you have any 7. ... ...