高中英语语法——祈使句（31张PPT）.ppt

1、GrammarImperatives(祈使句)No smoking!Dont drink!Attention！Parking!What do they mean?Grammar-1.Look&Say Look at the signs and say what they do.Dont go faster than 90 kph.Turn right.Dont walk./No pedestrians.Dont turn left./No left turn.Dont stop./No parkingThey give instructions 一.祈使句的定义用于表达命令、请求、劝告、警告、

2、禁止等的句子叫做祈使句。Look at the following sentences:n Go and wash your hands.（去洗手。命令）n Be quiet,please.（请安静。请求）n Be kind to our sister.（对姊妹要和善。劝告）n Look out！Danger！（小心！危险！警告）n 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DontAre the following sentenc

3、es imperative?(discuss in pairs)He is always sleeping in the class.Its a beautiful day,isnt it?Tell me your name,please?Will he come tonight?Mary,come here!()()()()()n二.祈使句的结构1.Observation Whatre the features of imperative?Listen to me carefully.Come in and sit down,please.Dont close the window its

4、hot.Be quiet!Be a good boy!Lets try our best to improve our environment.ListenComesitDontBeLetsBe2.Conclusion Do 型（以行为动词开头）Stand up!Dont stand up!/Never stand up!Be 型（以be动词开头）Be careful.Dont be late./Never be late.Let型（以let开头）Let him in.Let me help you.肯定结构:n 否定结构:n Do型和Be型的否定式都是在句首加dont构成。如:不要忘记我!n

5、 Dont forget me!/Dont be late!n 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:别让他走。n Dont let him go./Let him not go.n 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！n No smoking!n 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

6、 road.GoRide 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 Dont stay go,keep,look,ride,stop,stay,watch outn三.祈使句中应注意的几个问题 Do be patient!Do sit down.Do write back when you receive his l

7、etter.Tom,you clean the room.Dont you be late again next time!What is different now?1.加强祈使句语气的方式:Do/you+动词原形此句型为“条件与结果”并存的句式，其中的祈使句可转化为if条件句。e.g.Work hard and you will succeed.=If you work hard,you will succeed.Hurry up,or you will miss the last bus.=If you dont hurry up,you will miss the last bus.2

8、.祈使句(,)+and/or+简单句是一种固定句式。这一句式也可以演变为“名词性短语+and+简单句”的形式。More time,and I could have done it better.如果多给我一些时间，我可以做得更好。3.祈使句的附加疑问句Open the door,_?Dont forget,_?Let us go there,_?Lets go there at once,_?will you?/（wont you）will youshall wewill youOpenDontLetsLet use.g.Put on your coat,pleaseits very cold

9、 outside.Turn down the TV setthe baby is asleep in the room.4.祈使句+波折号+附加信息；附加信息常表示发出祈使动作的原因。2._ remember to turn off the lights before you leave the lab.A.Be sure B.Do C.Make sure D.Does1.Stand over there _ youll be able to see it better.A.or B.while C.but D.and 走近高考：3.Let us pass,_?A.shant we B.sha

10、ll we C.wont we D.will you 4.Wait a minute,_?A.shall you B.will you C.do you D.dont you 5._ down the radiothe babys asleep in the next room.A.Turning B.Turned C.Turn D.To turn 祈使句以动词原形开头。6 Youd better not smoke here,_?A.will you B.shall you C.have you D.had you 有had better 的句子构成反意疑问句,用had 构成。7.Dont

11、forget to phone me,_?A.do you B.neednt you C.wont you D.will you 否定祈使句的反意疑问句用will 构成。8.Lets have a cup of tea,_?A.shall you B.will you C.shall we D.wont you 以lets 开头的祈使句用shall we,以let us开头的祈使句用 will you,构成反意疑问句。9._,I think,and the problem could be settled.A.If you dont doubt your efforts B.As you ke

12、ep up your spirits C.Making great efforts D.A bit more efforts10.Its really very dangerous.One more step,_the baby will fall into the well.A.or B.so that C.and D.if Grammar-6.Practice(3ms)1.-English has a large vocabulary,hasnt it?-Yes._ more words and expressions and you will find it easier to read

13、 and communicate.A.Know B.Knowing C.To know D.Known2 Stand over there _ youll be able to see it better.A.or B.while C.but D.and 3.-Ive never seen anyone run so fast.-_ David go.A.just watch B.just to watch C.just watching D.just having watchedADAGrammar-6.Practice(3ms)4.-Dont forget to my birthday p

14、arty tomorrow.-_.A.Yes,I wont B.No,I wont C.No,I will D.Yes，I will 5.Be sure to write to us,_?A.will you B.arent you C.can you D.mustnt you 6.One more week,_ we will accomplish the task.A.or B.so that C.and D.if BACGrammar-6.Practice 7._ blood if you can and many lives will be saved.A.Giving B.Give C.Given D.To give 8._ this book and tell me what you think of it.A.Look through B.Look on C.Look into D.Look up 9._it with me and Ill see what I can do.A.When left B.Leaving C.If you leave D.LeaveBAD