外研 高中英语必修4Module 2Grammar课件.pptx-(纯ppt课件,无音视频素材)

1、Teaching Aims 1.Master the definition of the imperatives.2.Master the varities of the drills of the imperatives.3 Through pracitces use the imperatives correctly.Look at the signs and say what they do.Turn right.Dont go faster than 90 kph.Dont turn left.No parking.Dont walk.1.They give advice.2.They

2、 give instructions.3.They give information.4.They give permission.祈使句祈使句祈使句用来表示命令、劝告、请求、禁止。祈使句用来表示命令、劝告、请求、禁止。通常主语通常主语you会省去，以原形动词为句首。会省去，以原形动词为句首。Open the door!Stand up!Come here!Hurry up!一、其肯定形式为一、其肯定形式为“动词原形动词原形+其它成分其它成分”，否定形式为否定形式为“Dont/Never+动词原形动词原形+其其它成分它成分”。如：如：Make yourself at home.Dont swi

3、tch off the light!Never say that!注意：注意：1.祈使句之后可用附加疑问祈使句之后可用附加疑问 句，以加强语气。句，以加强语气。若祈使句为肯定形式，附加问句通常用若祈使句为肯定形式，附加问句通常用will you或或 wont you；若祈使句为否定形式，；若祈使句为否定形式，附加问句则用附加问句则用will you。如：如：Tell me the truth,will/wont you?Dont be late for the meeting,will you?二、第一人称祈使句二、第一人称祈使句 “Let me/us+动词原形动词原形+其它成分其它成分”。“

4、Lets+动词原形动词原形+其它成分其它成分”。其否定形式可以在句首加其否定形式可以在句首加Dont 也可以在也可以在Let me/us或或Lets后加后加not。如：如：Let me/us have a try.Lets consider ways of making it easier.Dont lets invite Gary to the party.Let me/us not go!Lets not say anything about it until we have the facts.注意：注意：以以Let me或或Let us开头的第一人称祈使开头的第一人称祈使句，附加问句用

5、句，附加问句用will you或或wont you。以以Lets开头的祈使句，附加问句用开头的祈使句，附加问句用shall we。如：如：Let me /us have a look at that letter,will/wont you?Lets go shopping this afternoon,shall we?三、第三人称祈使句三、第三人称祈使句 其肯定形式为其肯定形式为“Let+第三人称代词第三人称代词宾格（或名词短语）宾格（或名词短语）+动词原形动词原形+其它其它成分成分”；其否定形式在句首加；其否定形式在句首加Dont。如：如：Let him finish his homew

6、ork before Monday.Dont let the kids go out.四、祈使句的特殊结构四、祈使句的特殊结构1.no+名词或动名词名词或动名词用于指示标牌、布告，意为用于指示标牌、布告，意为“禁止，不许禁止，不许”。No parking!No spitting!No litter!No entry!No scribbling on the wall!2.be+过去分词过去分词Be seated,please.Be reassured.Be gone！3.do+祈使句祈使句这种结构表示强调，常译为这种结构表示强调，常译为“务必，务必，一定要一定要”。Do save us!Do

7、tell me the reason.Do be honest.4.无动词祈使句无动词祈使句一般来讲，祈使句都要有动词，但是有些一般来讲，祈使句都要有动词，但是有些用于口号、告示等的祈使句却是没有动词用于口号、告示等的祈使句却是没有动词的，虽为只言片语，却简洁明了。的，虽为只言片语，却简洁明了。Patience!Danger!After you!Hands up！This side down!祈使句常考查句式祈使句常考查句式1).祈使句祈使句+and/or+陈述句陈述句 Work hard and you can make rapid progress in your study.2).祈使句

8、祈使句+破折号破折号+陈述句陈述句 Try some of this juice perhaps youll like it.尝尝这种果汁，也许你会喜欢的。尝尝这种果汁，也许你会喜欢的。【拓展【拓展】3)名词词组名词词组+and+陈述句陈述句,名词词组中通名词词组中通常含有常含有more,another,further,earlier Another$500 and I could buy a car.假如我再有假如我再有500磅，就能买辆小汽车了。磅，就能买辆小汽车了。Turn rightDont go faster than 90 kph.Dont turn left./No left t

9、urn.Dont stop./No parking.Dont walk/No pedestriansadvicepermissioninformationinstructionsGrammar-1.Look at the signs and say what they do.1.Listen to me carefully.2.Come in and sit down,please.3.Dont close the window its hot.4.Be quiet!5.Lets try our best to improve ourenvironment.Grammar-2.Observat

10、ion Whats the features of Imperatives Conclusion 1 祈使句的肯定形式主要有以下几种Do 型（以行为动词开头）Stand up!Be 型（以be动词开头）Be careful.Let型（以let开头）Lets go home.Conclusion 2 祈使句的否定形式主要有以下几种Do 型（以行为动词开头）Dont stand up!/Never stand up!Be 型（以 be 动词开头）Dont be late./Never be late.Let型（以let开头）Lets not go home.Conclusion 3 Do be p

11、atient!Do sit down.Do write back when you receive his letter.Tom,you clean the room.You clean the window.加强祈使句语气的方式加强祈使句语气的方式:在谓语前在谓语前+do/或加上主语（或加上主语（Tom,you)Open the window,please.Will you go fishing with me this afternoon?Would you do me a favor?Grammar-3.Do you know how to make imperatives more p

12、olite?Could you show me how to get to the railway station?Hand the dictionary to me,will you?Lets go out for a walk,shall we?Why dont you get something to drink?I suggest we(should)take the train.SummaryWill you/Would you/Could you+动词动词原形原形?句末句末,+please?句末句末,+will you/shall we?Why not do something?W

13、hy dont you do something?Youd better do something.I suggest No smokingNo litterActivity 3.Read these dos and donts for motorists stuck in a traffic jam.Tick the ones you agree with.DosSwitch off the motor.Turn on the car radio.Speak to your passengers.Follow the rules of the road.Keep cool.DontsLeav

14、e the motor on.Blow your horn.React when others drive badly.Break the rules of the road.Get angry.I.Complete the following sentences.1._ on the pavement.2._ in the bicycle lanes.3._ at red traffic lights.4._ the rules of the road.Dont go Stay Stop Keep break go keep look ride stop stay watch out 5._ for pedestrians(行人行人).6._ behind you before you turn right or left.7._ in the middle of the road.Look Watch out Dont ridebreak go keep look ride stop stay watch outSummary 1.Review Grammar.2.Finish the exercises 1-3 on page 73.