If引導條件狀語從句語法：例句：Ifpeopleobeythetrafficrules,therewillbefeweraccidents.

if引導條件狀語從句if:隸屬連詞，意思是：“假如，假如，倘若”→從句→主句Therewillbefeweraccidentsifpeopleobeythetrafficrules.

原句可改為：if引導條件狀語從句既能夠放在句子前，也能夠放在句子后。從句位于主句之前時，慣用逗號將其與主句隔開。

結構：Ifitrainstomorrow,Iwillstayathome.If

youarehard-working,yourparentsmayfeelhappy.Studyhard,

ifshewantstogetgoodgrades.主將從現，主情從現主祈從現，if引導條件狀語從句和if引導賓語從句區分:If在賓語從句中翻譯為“是否”If在條件狀語從句中翻譯為“假如”I’llgotoseeyouifIamfreenextweek.Iwanttoknowifheisateacher.whether1.if在句中含義不一樣2.if在從句中位置不一樣If引導賓語從句放在主句之后；而if引導狀語從句可放在主句之前也可放在主句之后=Ifitdoesn’train,Iwillgoouttomorrow.Iwillgoouttomorrowifitdoesn’train.Idon’tknowifthetrainhasarrived.找出以下句子中哪些是if條件狀語從句，哪些是if賓語從句1.Canyoutellmeifshecancometothemeeting?2.Shewillnotgothereifitisrainytomorrow.3.Ican’tguessifshewillbeangry.4.Ifwehelpeachother,webothwillgetgoodresults.3.時態要求上有區分：口訣If引導條件狀語從句時態為普通現在時記住“主將從現”1.Iwanttoknowifthere

asportsmeetingnextmonth.doesn’trainwillbe2.Ifit

,we’llholdit.If引導賓語從句時態由主句及本身時態決定；If是否，普通未來；if假如，普通現在----Sam,doyouknowifAlice____tomypartynextweek?----Ithinkshewillcomeifshe____free.Acomes;isBwillcome;willbeCwillcome;isDcomes;willbeIf引導條件狀語從句練習1

wedon’tknowifit_____tomorrow,ifit___,wewon’tgohiking.(snow)Thesenseofhappinesswillincreaseifyou____whatyouliketodo.(do)3Ifshe_______________(notget)upearly,she’llmisstheearlybus.4bequick,please,oryouwillbelateforschool.___you____quick,youwillbelateforschool.1.Ifyou_____totheparty,you’llhaveagreattime.A.willgo

B.went

C.go

D.going2．I____hertheanswerifshe____me.A.cantell,willask

B.willtell,willask

C.wouldtell,ask

D.willtell,asksCD3.–Whatareyougoingtodotomorrow?

--We’llgotothelibrarytomorrowifit___.A.isn’train

B.rain

C.won’train

D.does