人教版(2024)八年級上冊英語Unit8語法(條件狀語從句)精講精練【語法聚焦一】條件狀語從句if引導(dǎo)的條件狀語從句if意為“如果”,表示正面條件，引導(dǎo)條件狀語從句，既可放在主句前面，也可放在主句后面。如果你去參加聚會，你將會玩得很開心。Mymotherwilltakemetotheparkifsheisfree我媽媽如果有空，就會帶我去公園考點(diǎn)：if條件句的時(shí)態(tài)搭配1.if從句用一般現(xiàn)在時(shí)，主句用一般將來時(shí)(主將從現(xiàn))Thecatwillscratchyouifyoupullhertail如果你拉貓的尾巴，它就會抓你。2.if從句用一般現(xiàn)在時(shí)，主句謂語含may/might/can(主情從現(xiàn))Ifthefoggetsthicker,theplanemaybediverted.如果再大一些，飛機(jī)可能就會改在別的機(jī)場降落。Ifitstopssnowing,wecangoout.如果雪停了，我們就可以出去。3.if從句用一般現(xiàn)在時(shí)，主句是祈使句。(主祈從現(xiàn))unless引導(dǎo)條件狀語從句Iwon'tgotohispartyunlessheinvitesme.=Ifhedo如果他不邀請我，我將不會參加他的聚會?？键c(diǎn)：當(dāng)主句用一般將來時(shí)或是祈使句時(shí)，unless引導(dǎo)的從句常用一般現(xiàn)在時(shí)。(主將從現(xiàn)/主祈從現(xiàn))Therewillbemorepollutionunlesspeopledriveless.如果人們不少開車，將會有更多污染。不要把水倒進(jìn)河里，除非你們保證它足夠干凈。區(qū)分if引導(dǎo)的條件狀語從句和if引導(dǎo)的賓語從句條件狀語從句，可以放在主句之前并用逗號隔開，也可放在主句之后；而if引導(dǎo)的賓語從句只能放在主句之后。因此如果把if放在主句之前，句子通順，意義不變，則是條件從句，否則是賓語從句。一、用所給詞的適當(dāng)形式填空2.Ifitisfine,we(go)forawalk.3.Ifitrainstomorrow,they(stay)athome.4.Youwillspoilitifyou(notbe)careful.5.Wewillbeverymuchpleasedifyou(come).6.Ifyou(feel)tired,you(have)tohavearest.7.Wherehe(see)thefilmifhe9.IfMarcia(live)alone,she(kee10.Lana(buy)anewdressiftheoldon11.IfMr.Green(say)Iamhard-working,myparents12.I(go)tothebeach14.He(writ15.Ifshe(get)uplate,sA.ifB.thatC.thoughD.whether()2.I'llgivethebooktohimiA.willcomeB.comes()3.Wewillhaveasportsmee第2頁共9頁第3頁共9頁A.won'tB.isn'tC.don'tD.doesn't()4.IfyoutothepartA.willgoB.wentC.go()5.—WhatareyougoingtodotoA.isn'trainB.rainC.won'train()6.—Thebookseemsalittleboring.A.whenB.ifC.afterD.unless()7.-Doyouknowifwewillgotothecinematomorrow?—Ithinkwe'llgoifwA.willhaveB.hadC.won'tA.won'trainB.is()9.—Idon'tknowifSam—Don'tworry.IwilltellyouifheA.willcome;comesB.comes;willcomeC.willcome;will()10.Iwanttoknowiftheresportsmeetingnextmonth.Iftheyit,ImustgA.is;willholdB.willbe;holdC.is:hold()12.—Jeff,couldyoutellmeifittomorrow.Ifittomorrow,IwillstayatA.rain;rainB.rains;rainsC.willrain;rainsA.got()14.—Do—Sorry,Idon'tknow.Whenheback,I()15.ThefootballmatchwillbeputoffifitA.willrainB.rainsC.rainedD.israinedA.rainB.israiningC.rainsD.willA.cantell,willaskB.willtellC.wouldtell,askD.willtell,asksA.didn'trainB.hasn'trained()20.Wehomeifthereisnobus.—Oh,whatapity!A.willwalkB.havewalkedC.walkedA.comeB.comesA.comesD.wouldcome)23.—Let'sgoclimbingifitthisSaturday.—Goodidea.Butnot A.isfine;rainsB.isfine;willrain1.如果努力學(xué)習(xí)，你就會取得好成績。IfheTVtoomuch,hisparentsunhappy.4.如果他有空，他會幫助你的。Ifhe_,heyou.5.你如果抄同學(xué)的作業(yè)就不能學(xué)好各門功課?！菊Z法聚焦一】條件狀語從句if引導(dǎo)的條件狀語從句if意為“如果”,表示正面條件，引導(dǎo)條件狀語從句，既可放在主句前面，也可放在主句后面。如果你去參加聚會，你將會玩得很開心。Mymotherwilltakemetotheparkifsheisfree我媽媽如果有空，就會帶我去公園if條件句的時(shí)態(tài)搭配1.if從句用一般現(xiàn)在時(shí)，主句用一般將來時(shí)(主將從現(xiàn))Ifheruns,he'llgetthereintime.如果他用跑的，他就會及時(shí)趕到那兒。Thecatwillscratchyouifyoupullhertail如果你拉貓的尾巴，它就會抓你。2.if從句用一般現(xiàn)在時(shí)，主句謂語含may/might/can(主情從現(xiàn))Ifthefoggetsthicker,theplanemaybediverted.如果再大一些，飛機(jī)可能就會改在別的機(jī)場降落。Ifitstopssnowing,wecangoout.如果雪停了，我們就可以出去。3.if從句用一般現(xiàn)在時(shí)，主句是祈使句。(主祈從現(xiàn))Workhardifyouwanttogetgoodgrades.你如果想取得好成績，就要努力學(xué)習(xí)。unless引導(dǎo)條件狀語從句unless意為“除非；如果不”,引導(dǎo)條件狀語從句，相當(dāng)于if..not.….Iwon'tgotohispartyunlessheinvitesme.=Ifhedoesn'如果他不邀請我，我將不會參加他的聚會。當(dāng)主句用一般將來時(shí)或是祈使句時(shí)，unless引導(dǎo)的從句常用一般現(xiàn)在時(shí)。(主將從現(xiàn)/主祈從現(xiàn))Don'tpourthewaterintotheriverunlessyoumakes二、用所給詞的適當(dāng)形式填空18.Ifitrainstomo19.Youwillspoilitifyou20.Wewillbeverymuchpleasedifyoucome(come).21.Ifyoufeel(feel)tired,youwillhave(have)24.IfMarcialives(live)alone,shewill25.Lanawillbuy(buy)anewdressiftheold26.IfMr.Greensays(say)Iamhard-working,myparentswillfeel(fee27.Iwillgo(go)tothebeachifitdoesn'train(notrain)(A)1.WhynotaskyourteacherforhelA.ifB.thatC.thoughD.whether(B)2.I'llgivethebooktohimifheherenextSunday.A.willcomeB.comes(D)3.WewillhaveasportsmeetingifitraintomorA.won'tB.isn'tC.don't(C)4.Ifyoutotheparty,A.willgoB.wentC.(D)5.—Whatareyougoingtodotomorrow?—We'lA.isn'trainB.rainA.whenB.ifC.afterD.unless(D)7.-Doyouknowifwewillgotothecinematomorrow?—Ithinkwe'llgoifwetoomuchB.willhaveB.had(D)8.—WewillgoforapicnicifitthisSunday.—SouA.won'trainB.willcome;comesB.comB)10.IwanttoknowiftheresptB.is;willholdB.willbe;holdC.is;hold(D)11.ThesportsmeetwillcoA.ifB.untilC.assoonasC)12.—Jeff,couldyoutellmeifittomorrow.IfittA.rain;rainC.willrain;rainsD.(B)13.Ifyoustudyhard,youintA.gotB.willget(A)14.—Doyouknowwhenhewi—Sorry,Idon’tknow.Whenhe(B)15.ThefootballmatchwillbeputoffifitA.willrainB.rainsC.raAIfBThoughCButA.rainB.israining(D)18.Ihertheanswerifsheme.(D)19.Thestudentswillplant