Unit8第3课时sectionAGrammarFocus课件-新人教八上

Unit8SectionAGrammarFocusWatchthevideoJourneytotheWestandfindoutifsentences.CanyousaymoreIf

sentence?IfIoversleep…Iwillmissthebus.IfImissthebus,Iwillbelateforschool.IfIamlateforschool,myteacherwillgetangry.IfIgotoLondon…IwillseetheBigBen.IfIgotoBuckinghamPalace,IcantakeaphotooftheRoyalGuard.IfyougotoLondon,youmust

look

rightbeforecrossingastreetReadthesentences.Findmoresentenceswithif-clausesinSectionA.Ifyouwanttosolvetheproblem,aface-to-facetalkusuallyworksthebest.Textingcanmakethingsworseifyou’renotcarefulwithyourwords.Iftherehearsalendsat7:00p.m.,I’llpickyouupat7:15p.m.Ifyoustaycalmandsaysorry,itwillhelp.IfIgothere,Iwilltryallthedeliciouslocalfood.3a观察你画出的if从句，它们在句子中的位置一样吗？一类是if从句在句首的（此时从句后加逗号）一类是if从句在句末的（此时从句前可不加逗号）Ifyoustudyhard,youwillpasstheexam.=Youwillpasstheexamifyoustudyhard.Ifyoustaycalmandsaysorry,itwillhelp.=Itwillhelpifyoustaycalmandsaysorry.IfyoustudyEnglishhard,you’lldobetterinEnglish.=You’lldobetterinEnglishifyoustudyEnglishhard.ExerciseIfyouwanttosolvetheproblem,aface-to-facetalkusuallyworksthebest.Textingcanmakethingsworseifyou’renotcarefulwithyourwords.Iftherehearsalendsat7:00p.m.,I’llpickyouupat7:15p.m.Ifyoustaycalmandsaysorry,itwillhelp.IfIgothere,Iwilltryallthedeliciouslocalfood.if从句主句主句和从句时态有什么规律主将从现一般现在时情态动词描述“条件”描述“结果”一般现在时一般现在时一般现在时一般现在时一般将来时一般将来时一般将来时一般现在时Grammarfocus特殊情况：主句表达客观事实、习惯性结论类型例句从句时态主句时态基础结构Ifyou

stay

calm,it

willhelp.特殊情况1Ifyouneedhelp,

call

me.特殊情况2Ifyoufinishearly,you

cango

home.特殊情况3（客观结论）Ifyoumixredandblue,yougetpurple.一般现在时一般现在时一般现在时will+动原祈使句（动词原形)情态动词（can/may等）if条件状语从句一般现在时一般现在时1.Ifyouexercisemore,you

(be)muchhealthier.2.Ifit

(rain)tomorrow,they

(notplay)soccerafterschool.3.Youshouldseeadentistifyou

(have)atoothache.4.lfhe

(walk)toschool,it

(take)himtoomuchtime.5.lfyou

(notgo)tobedearlier,you

(feel)tiredinthemorning.6.lfit

(notrain),he

(play)basketballwithmetomorrow.Exercisewillberainswon'tplayhavewalkswilltakedon'tgowillfeeldoesn’trainwillplayFillintheblanks.Ifitrains,wewillcancelthepicnic.Youcanjoinusifyoufinishyourhomework.Iwonderifhewillcometotheparty.Couldyoutellmeiftheshopisopentoday?if宾语从句（表是否）if条件状语从句（表如果）这两组句子里的if，含义一样吗从句的位置，主句时态有什么不同？if引导的宾语从句if引导的条件状语从句例句含义位置时态是否如果主句现在，从句随便主句过去，从句随变“主将从现”Iwonderifitwillraintomorrow.Iwonderedifhewasfree.Ifitrains,Iwillstayathome.Iwillstayathomeifitrains.易混淆点对比（if宾语从句vsif条件状语从句）句首（加逗号）/句末主句后（不加逗号）Ifyoudon’tunderstand,youcanasktheteacher.（

）Sheaskedifyoucouldhelpherwiththeproject.（

）Ifitisfinetomorrow,wewillhaveapicnic.（

）Doyouknowifthereisalibrarynearhere?（

）Youwillmakeprogressifyoukeeppracticing.（

）请判断下列句子中if引导的是条件状语从句还是宾语从句，将答案填在括号内。条件状语从句条件状语从句条件状语从句宾语从句宾语从句Matchthetwopartstomakesentences.1.Ifwecanhaveaface-to-facemeeting，A.trytexting.2.IfIhavegoodnews，B.we′llunderstandeachotherbetter.3.Ifyouneedtoleave，C.youcanwritethingsdownforhim.4.Ifyoucanfinishyourworkearlytoday，D.I′llcallyourightaway.5.Iftheoldmanhasdifficultiesinhearing，E.I′llcallataxiforyou.6.Ifyoucan′treachherbyphone，F.willyoujoinmefordinner?3b...Ifthings____________(go)well,we____________(see)allthoseoldfacesagain.Justthinkhowgreatitwillbe!Ifyouthinkyoucancome,____________(drop)mealineandI____________(give)youallthedetailsaboutthereunion.Butpromisemeyou’llthinkaboutitseriously.Fillintheblankswiththecorrectformsoftheverbsinbrackets.Thendiscusswhatthesituationsareandwhomtheinformationisfor.gowillseedropwillgive3cHey,it’sme.Iwantedtotalktoyouaboutthetrainingplanforourteam.Thenewseasoniscoming,soit’stimetomakeaplanforourtraining.Ifwe___________(start)earlierthisyear,Ithinkwe_____________(perform)better.___________(give)meacalland___________(let)meknowifyou___________(think)ofagoodtimeforeveryonetomeet.Talktoyousoon!startwillperformGiveletthinkdropmealine给我写封短信...Ifthings____________(go)well,we____________(see)allthoseoldfacesagain.Justthinkhowgreatitwillbe!Ifyouthinkyoucancome,____________(drop)mealineandI____________(give)youallthedetailsaboutthereunion.Butpromisemeyou’llthinkaboutitseriously.gowillseedropwillgiveAninvitationtoa

reunionparty.Oldfriendswhohaven'tseeneachotherforalongtime.Discusswhatthesituationsareandwhomtheinformationisfor.Hey,it’sme.Iwantedtotalktoyouaboutthetrainingplanforourteam.Thenewseasoniscoming,soit’stimetomakeaplanforourtraining.Ifwe___________(start)earlierthisyear,Ithinkwe_____________(perform)better.___________(give)meacalland___________(let)meknowif