Unit4GrammarGivinginstructions&Using'should'and'hadbetter'TolearntogiveinstructionsTolearntouseshould&hadbetterObjectivesTurnleftTurnrightWalkstraightCanyouguesswhatthesesignsmean?Don’tsmoke.Don’ttalkloudly.Don’ttakephotos.Whatcanweusesuchsentencestodo?*Turnaround!*Walkstraighton!*Becareful!*Don’tmoveforward!*Don’tbehurried!*Drawanose!TellpeoplewhattodoortellpeoplenottodosomethingGivinginstructions1.祈使句的概念祈使句表示請求、命令等。它的主語是?you（聽話人），通常不說出。祈使句肯定結構中的謂語動詞一律動詞原形。祈使句末用驚嘆號或句號，句子用降調。2.祈使句的結構

1)祈使句的肯定結構①Do型（以行為動詞原形開頭），例如：

Sit

down!坐下！

Stand

up!起立！

②Be型（以be開頭），例如：

Be

quiet!安靜！

Be

careful！小心！●表示請求、勸告的祈使句還常常在句前或句末加上please,

構成句式：Please…或…,please.

以使語氣更加緩和或客氣。例如：

Please

stand

up.或Stand

up,please.請站起來。

Please

have

a

rest.或Have

a

rest,please.請休息一下。也可以加個人名。Sandy,Stand

up,please.

2)祈使句的否定結構，一律在肯定結構加

Do

not

(Don’t)。例如：

Don’t

go

there,please.請別去那兒。Don’t

be

late

for

class!上課別遲到！Don’t

let

him

in.

不要讓他進來。祈使句的否定也可以用Never+動詞原型注意回答：OK/sorry，Iwon’t.注意：祈使句，and/oryouwill…Getupearlier,andyouwillarriveontime.Getupearlier,oryouwon’tarriveontime.可以和if的句型互換Ifyougetupearlier,youwillarriveontime.Ifyou

don’tgetupearlier,youwon’tarriveontime.Let'slearntodoaDIYjob!cutwritedrawlook&sayDoyouknowhowtomakecards?_______outpiecesofcardwithapairofscissors._______somewordsorasentenceoneachcard._______apictureaboutthewordsorsentenceontheothersideofthecard._______atthepictureand______tosaywhatisontheotherside.Please__________(notgive)up._______tryingandyouwillfindyoucanrememberthingsbetter.CutWriteDrawLooktrydon’tgiveKeepWecandrawaconclusion!肯定形式：Do(V原形)+sth.否定形式：Don’tdosth.肯定形式：Be+表語(adj./n.)否定形式：Don’tbe+表語(adj./n.)Howtomakesentencesinapoliterway?

houldSometimesorderingothersisnotawisechoicebutgivingadviceinapolitewayisthebest!

Wecanchangethestrongword“must”into“s______”.Whatcanweusetogiveadvicepolitely?Whatcanyousaytoyourparentsorteacherswhenyouwanttogivethemsomeadvice?should&hadbetterTellpeoplewhatwethinkisthebestorright

thingtodoGivingadviceThetoneisstrongerhadbetter(常簡略為’dbetter)，是一固定詞組，后面必須跟動詞原形，沒有人稱和數(shù)的變化。構成：hadbetterdosth.句型。You’dbettergotohospitalatonce.你最好立即去醫(yī)院看病。

Tom,you’dbettergotheretoday.湯姆，你最好今天去那兒。hadbetter的否定式是將not直接放在hadbetter的后面。Youhadbetternotmissthelastbus.你最好不要錯過末班公共汽車。should后面也要跟動詞原形，且沒有人稱和數(shù)的變化。Youshouldstopsmoking.你應該戒煙。should的否定式是shouldnot/shouldn’t。Youshouldn’tdrinkanddrive.你不應該喝酒后開車。Groupwork:DoyouknowhowtogiveDIYadvicetoothers?TherearemanyusefulbooksaboutDIY.DIYisnoteasy.Instructionsareimportant.Scissorscanbedangerous.Sometimesit’lltaketimetodoaDIYjob.Youshould/hadbetterbuysometolearnmoreaboutit.Youshould/hadbetterjoinaDIYclubtolearnmoreaboutit.Youshouldnot/hadbetternot

beginyourworkwithoutreadingthem.Youshouldnot/hadbetternot

playwiththemwhenyoudoDIYjobs.Youshould/hadbetterbepatient.Wecandrawaconclusion!肯定形式：shoulddo+sth.否定形式：shouldnotdo+sth.肯定形式：hadbetterdosth.否定形式：hadbetternotdosth.ConclusionTones(語氣):hadbetter>shouldBothofthemfollowsa_____behind.doCanyougroupmyinstructionsintotwoparts?*Turnaround!*Walkstraighton!*Becareful!*Don’tmoveforward!*Don’tbehurried!*Drawanose!肯定形式否定形式請點擊Drawtheconclusion(得出結論)祈使句的結構如下：

(Please)+dosth.

(Please)+Don’tdosth.肯定：否定：祈使句的句型：Bequiet.Pleasehaveaseat.David,payattention.Don’tbeafraid.Pleasedonot

make

anoise.Alan,don’t

belate.1.動詞+…2.Please+動詞…

3.人名+動詞…肯定否定在動詞前面加don’t否定Givingorders/instructions

祈使句:是表示請求、命令、建議等句子，通常說話的對象是第二人稱you,you常被省略。注意：Let’s+（not）動詞原形…Eg.Let’sgohometogether./let’snot

talkintheclass.2.let’s……,shallwe?3.Letsb….,willyou?

4.祈使句，willyou?反意疑問句祈使句

祈使句,無主語,只用動詞就可以.表示請求或命令,加上please表客氣。如果變成否定句，Don’t開頭是規(guī)律。Notalking!是警示，祈使句用法要牢記。Let’sdosomeexercises!___________(notbe)lateforschoolagain.It’scoldtoday.Youhadbetter___________(notwear)adress.Weshould________(do)ourbesttolearnEnglishwell.It’sraining.Let’s______________(notgo)totheplayground.Youmustletyourson_________(do)hishomeworkbyhimself.Don’tbenotweardonotgodoLet’sdosomeexercises!()1.—Jim,_____readbookswhileyouarewalkinginthestreet. It’sverydangerous.—OK,thankyou.【2013揚州】A.don’tB.doesn’tC.won’tD.can’t()2.—______up,Anna.It’sseventhirty.—Onemoreminute,Mum.A.GetB.GetsC.GettingD.Got【2013濟南】()3.Doyouwanttobehealthy?__________.Smilingcanhelpyou stayhealthy.A.SmileB.SmilingC.TosmileD.Smiled【2013河南】()4.‘______exerciseeveryday,myson.It’sgoodforyourhealth.’ Dadoftensaidtohim.A.TakesB.TakingC.TakeD.Totake【2013甘肅】()5.Let'sgototheisland,_________?

A.won'tyouB.willyouC.shallweD.willwe【2013黔東南】I.單項選擇。1.TheTVistooloud.Please_______.

A.turnitdown

B.toturnitdown

C.turndownit

D.toturndownit

2._______lateagain,Bill!

A.Don'ttobe

B.Don'tbe

C.Notbe

D.Benot3._______crosstheroaduntilthetrafficlightsturngreen.

A.Not

B.Won't

C.Doesn't

D.

Don't

4._______methetruth,orI'llbeangry.

A.Telling

B.Totell

C.Told

D.TellII.句型轉換。1.Willyoupleasereaditagainmoreslowly?(改為祈使句)

_______againmoreslowly,please.

2.Ifyoudon'tlistentome,I'llgo.(改為同義句)

________me,orI'llgo.

3.Theteachersoftentellthestudentsnottobecareless.

(改為祈使句)

________ca