1、七年级英语下册Unit 4祈使句语法知识讲解及练习一、知识讲解（一）什么是祈使句？祈使句用于表达命令、请求、建议或劝告。句子的主语“你”通常被省略，我们以动词原形开头。（二）祈使句的类型1.Do型肯定句：以动词开头。例如：Open the door.打开门。Read the text aloud.大声朗读课文。否定句：在动词前加“Dont”。例如：Dont shout in the library.别在图书馆大喊大叫。Dont forget your homework.别忘了你的家庭作业。2.Let 型肯定句：“Lets”（包括说话者和听话者双方）或“Let us”（通常不包括听话者）+ 动词
2、原型。例如：Lets go to the zoo.我们去动物园吧。Let us finish this project.让我们完成这个项目。否定句：在“Lets/Let us”后加“not”。如：Lets not miss the bus.我们别错过公交车。3.Be 型肯定句：“Be + 形容词/名词”。比如，例如：Be brave.要勇敢。Be a good student.做个好学生。否定句：“Dont be + 形容词/名词”。假如：Dont be shy.别害羞。4.No 型用于表示禁止，结构为“No + 名词/动名词”。例如，No smoking.禁止吸烟。No parking.禁止
3、停车。（三）祈使句的反意疑问句（1）肯定祈使句：用“will you”或“wont you”。例如，“Close the window, will you/wont you?”关上窗户，好吗？（2）否定祈使句：总是用“will you”。比如：Dont make noise, will you?“别吵闹，好吗？”Lets：后面接“shall we”。例如，Lets have a break, shall we?“我们休息一下，好吗？”Let us：用“will you”。例如：Let us leave now, will you?“让我们现在离开，好吗？”（3）强调祈使句，在动词前加“do”来
4、加强语气。例如，“一定要早点来！”（Do come early!）“一定要小心！”（Do be careful!）（四）如何回应祈使句？对肯定祈使句的回应表示同意：“好的。”（OK.），“行。”（All right.），“当然。”（Sure.），“很乐意。”（With pleasure.）“Clean the blackboard, please.”“OK, I will.”对否定祈使句的回应接受劝告：“好的，我不会了。”（No, I wont.）“Dont play with the knife.”“No, I wont.”对 Let 型祈使句的回应对于“Lets”：“好主意。”（Good
5、idea.），“太棒了。”（Great.）对于“Let us”：“好的。”（All right.），“可以。”（Yes, you can.）二、巩固练习（一）单项选择题1._ the window, please.Its too hot in the room.OK.A.Opening B.Open C.To open D.Opens2.Lets _ basketball after school.Good idea!A.play B.plays C.playing D.to play3._ be late for class again, Tom.A.Not B.Doesnt C.Dont
6、D.Cant4.Mum, Im feeling very tireD._ a rest then.A.Do have B.Had C.To have D.Having5._ careful when you cross the roaD.I will.Thanks.A.Being B.Be C.To be D.Is6._ noise in the library.Sorry, I wont.A.Not make B.Dont make C.No make D.Makes no7.The sign says “_ swimming in the river!”Oh, I see.A.Not B.
7、Dont C.No D.Cant8.A: Dont run in the corridor.B: _.Im sorry.A.No,I wont.B.No,I dont.C.Yes,I will.D.Yes,I wont.（二）填空题1._ (Open) your books and turn to Page 10.2.Lets _ (go) to the cinema tonight.3._ (not be) afraid of making mistakes.4.Dont forget to bring your homework tomorrow.No, I _.5._ (be) a polite person and youll make more friends.6.Let us go out for a walk, _?OK.7._ (do) remember to call me when you arrive.8.Look at the sign! It says “_ (no park)”.【参考答案】单项选择题：BACABBCA填空题：1.Open 2.go 3.Dont be 4.wont 5.Be 6.will you 7.Do 8.No parking4
