牛津版八年级上Unit4-grammar课件(共54张ppt)

GrammarUnit4GrammarATurnleft!GuessingGameTurnright!GuessingGameWalkonthezebracrossing!GuessingGameGuessingGameDon’tsmoke!Nosmoking!GuessingGameDon’tparkyourcar!GuessingGameDon’tpicktheflowers!Readandobserve(观察)Turnleft!Turnright!Walkonthezebracrossing!Don’tsmoke!Don’tparkyourcar!Don’tpicktheflowers!Theyareallimperativesentences.（祈使句）句子Westartasentencewiththebaseformofaverbwhenwewanttotellpeoplewhattodo.Weadd‘don’t’infrontoftheverbwhenwewanttotellpeoplenottodosomething.祈使句的结构如下：

dosth

Don’tdosth.肯定：否定：祈使句表示请求、命令、建议等等。谓语动词一律用原形。句子中通常不用主语，句末用感叹号或者句号。Drawtheconclusion(得出结论)祈使句句式详解1.

肯定的祈使句

（1）动词原形+其他

Stand

up,

please.

=

Please

stand

up.

请起立。

（2）Be

+

adj.

Be

careful!

=

Look

out!

=

Take

care!

小心

/

当心！

（3）Let's

+

动词原形

Let’s

go

to

school

together.

咱们一起上学去吧。祈使句句式详解2.

否定的祈使句（1）

Don't

+

动词原形

Don't

stand

up.

别站起来。

Don't

be

careless.

别粗心。

Don't

let

them

play

with

fire.

别让他们玩火。

（2）Let's

(

let

sb

)

+

not

+

动词原形

Let's

not

say

anything

about

it.

对于这件事，咱们什么也别说。

Let

them

not

play

with

fire.

别让他们玩火。祈使句句式详解

与please连用,使语气委婉

为使语气委婉，通常将祈使句与please连用。Please可用于祈使句的句首，通常不用逗号如果用于句末，前面通常用逗号。如：Pleasedon’tgetangry.请不要生气。Pleasedrivemoreslowly.请开得慢一点。

Trytobequiet,please.请设法保持安静。

Putupapictureonthewall.Putupashelfonthewall.TrytogiveinstructionsDon’tswimhere.Don’tparkyourbikehere.Parkyourbikehere.Pleasegoslowly.Don’tsmokehere.Don’tfishhere.Bequiet,please.Don’tmakeanynoise.Millieisteachingherclassmateshowtomakecardstohelpthemrememberthingsbetter.LookatthepicturesandhelpMilliecompletetheinstruction.Howtomakecards_____outpiecesofcardwithapairofscissors.Cut

cutdrawgivekeeplooktrywrite_____somewordsorasentenceoneachcard.Write

cutdrawgivekeeplooktrywrite_____apictureaboutthewordsorsentenceontheothersideofthecard.Draw

cutdrawgivekeeplooktrywrite_____atthepictureand___torememberwhatisontheotherside.Looktry

cutdrawgivekeeplooktrywritePlease_________(not)up.____trying,andyouwillfindyoucanrememberthingsbetter.

don’tgiveKeep

cutdrawgivekeeplooktrywrite1--It’sherbirthdaynextweek.--Then___________heraboutthesurprisebirthday.(tell)2–HowcanIgettoPeople’sHospital?--_____alongthestreetand______leftatthelights.don’ttellturn

GoExercises3--Wehavetofinishtheworkintwohours.--Thenlet’s__________anytime.(waste)4--____________somuchnoise,please.--Ok.(make)notwasteDon’tmake1.剪出……2.写一些话或一个句子3.在每张卡上4.在卡的另一面5.尝试做某事6.记住某事7.放弃8.放弃某事/做某事9.坚持尝试10.把事情记得更好cutout…writesomewordsorasentenceoneachsideontheothersideofthecardtrytodosth.remembersth.giveupgiveupsth./doingsth.keeptryingrememberthingsbetterUsefulExpressionsGrammarBUsingshouldandhadbetterWeuse‘should’and‘hadbetter’whengivingadviceandtellingpeoplewhatisthebestorrightthingtodo.Thetoneofhadbetterisstrongerthanshould.had

better

do

sth

had

better

not

do

sth

It

is

pretty

cold.

You'd

better

put

on

my

coat.

She'd

better

not

play

with

the

dog.shoulddosthshouldnotdosthYoushouldbequietinclass.Youshouldnotbelateforschool.1.PleaseknowalittleaboutDIY.YoushouldknowalittleaboutDIY.Weuse‘should’and‘hadbetter’whengivingadviceandtellingpeoplewhatisthebestorrightthingtodo.YouhadbetterknowalittleaboutDIY.2.Pleaseputinabrighterlightintheroom.Youshouldputinabrighterlightintheroom.Weuse‘should’and‘hadbetter’whengivingadviceandtellingpeoplewhatisthebestorrightthingtodo.Youhadbetterputinabrighterlightintheroom.3.Don’thitthepipe.Youshouldnot/shouldn’thitthepipe.Youhadbetternothitthepipe.Weuse‘should’and‘hadbetter’whengivingadviceandtellingpeoplewhatisthebestorrightthingtodo.4.Don’tpaintthewholeroomblue.Youshouldnot/shouldn’tpaintthewholeroomblue.Youhadbetternotpaintthewholeroomblue.Weuse‘should’and‘hadbetter’whengivingadviceandtellingpeoplewhatisthebestorrightthingtodo.DIYadviceSuzyisgivingDIYadvicetoherclassmates.Readtheadvicebelow.HelpSuzymakesentenceswithshould(not)orhadbetter(not).DIYadviceReadtheadviceandmakesentenceswithshould(not)orhadbetter(not).beginyourworkwithoutreadingthem

Youshouldn’tbeginyourworkwithoutreadingthem.Youhadbetternotbeginyourworkwithoutreadingthem.DIYadviceReadtheadviceandmakesentenceswithshould(not)orhadbetter(not).joinaDIYclubtolearnmoreaboutit

YoushouldjoinaDIYclubtolearnmoreaboutit.

YouhadbetterjoinaDIYclubtolearnmoreaboutit.DIYadviceReadtheadviceandmakesentenceswithshould(not)orhadbetter(not).bepatient

Youshouldbepatient.Youhadbetterbepatient.DIYadviceReadtheadviceandmakesentenceswithshould(not)orhadbetter(not).buysometolearnmoreaboutit

Youshouldbuysometolearnmoreaboutit.

Youhadbetterbuysometolearnmoreaboutit.DIYadviceReadtheadviceandmakesentenceswithshould(not)orhadbetter(not).playwiththemwhenyoudoDIYjobsYoushouldnotplaywiththemwhenyoudoDIYjobs.YouhadbetternotplaywiththemwhenyoudoDIYjobs.abeginyourworkwithoutreadingthembjoinaDIYclubtolearnmoreaboutit

cbepatient

dbuysometolearnmoreaboutit

eplaywiththemwhenyoudoDIYjobs1.TherearemanyusefulbooksaboutDIY.Youshould/hadbetterbuysometolearnmoreaboutit.2.DIYisnoteasy.You

should/hadbetterjoinaDIYclubtolearnmoreaboutit.You

shouldn’t/hadbetternotbeginyourworkwithoutreadingthem.3.Instructionsareimportant.You

should/hadbetterbecarefulwhenyouusethem.4.Scissorscanbedangerous.You

should/hadbetterbepatient.5.Sometimesit’lltaketimetodoaDIYjob.1.当我们向他人发出命令、提出要求或建议时，常使用祈使句。其主语通常不明确表示出来。其否定形式是在动词原形前加donot/don’t。为了表示客气和礼貌，可以加上please。2.当我们给他人提建议时，可以用hadbetter和should，表示“最好”或“应该”做某事。否定形式是hadbetternot和

shouldnot/shouldn’t。ReflectionLet’sdoexercise.1.Jim,_____meahand.A.givesB.isgivingC.willgiveD.give2.____careful,Jenny!Thereisatreeinfrontofyou.A.AmB./C.BeD.Was3.Let's____ourtime.A.notwasteB.nowastingC.nottowasteD.nowaste4.—____higher,andyouwillseethehouse.

—OK.A.IfyoustandB.TostandC.WhenyoustandD.StandExercises:5.Please___doit.A.heB.lethimC.letheD.him6._____letanyoneopenthedoor.A.Don'tB.WillC.NotD.No7.—Don’tbelateagain.

—Sorry,______.A.ImayB.ImustC.IwillD.Iwon’t8.—Callmewhenyougethome.

—OK,____.A.ImustB.IcanC.IwillD.ImayExercises:9._____forgettowritetomewhenyou_____gettherenextTuesday.A.Don't;willB.Please;willC.Please;/D.Don't;/10._____letanyoneopenthedoor.A.Don'tB.WillC.NotD.No11.____6and4,andyouwillgetten.A.AddedB.AddingC.ToaddD.Add12..____lateagain,orI’llreportittoyourfather.A.Don’tbeB.Youaren’tC.Can’tbeD.Aren’t

13.--CanIleavethisdooropenatnight?---You_______betternot.A.shouldB.wouldC.couldD.had14.You_____smokewhileyouarewalkingaroundinthewoodshere.A.shouldB.shouldn'tC.shouldn’ttoD.shouldtoI.单项选择。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.