if 引導(dǎo)的真實(shí)性條件狀語從句ppt

中考復(fù)習(xí)專題之

——if與unless引導(dǎo)的

真實(shí)性條件狀語從句渡普中學(xué)徐愛玲一.什么叫條件狀語語從句？

由連接詞if或unless引導(dǎo)的狀語從句叫做條件狀語從句。條件狀語從句用來說明主句動(dòng)作發(fā)生的條件，即某一件事情（從句中的動(dòng)作）實(shí)現(xiàn)之后，其他事情（主句中的動(dòng)作）可能發(fā)生。其中if是“如果，假如”的意思.unless是“除非，如果不”的意思。

二.if引導(dǎo)的條件狀語從句的位置：

if引導(dǎo)的條件狀語從句，既可以放在主句之前，也可以放在主句之后。當(dāng)從句置于主句之前時(shí)，常用都用逗號(hào)與主句隔開。Forexample:Youwillcatchthebusifyougetupearly.==Ifyougetupearly,youwillcatchthebus.三.if引導(dǎo)的條件狀語從句中主從句的時(shí)態(tài)：1.若主句是一般將來時(shí)，if引導(dǎo)的從句用一般現(xiàn)在時(shí)。Forexample:

Ifitrains

tomorrow,I’llstayathome.2.

如果主句是祈使句或含情態(tài)動(dòng)詞can,may,must，等時(shí)，從句也用一般現(xiàn)在時(shí)。Forexample:1).Youmustseethedoctorifyouareill.2)Don’twearwarmclothesifyouwanttogoskating.1.主句不能用begoingto表示將來時(shí)，只能用will!2.在if引導(dǎo)的條件狀語從句中，不能使用some,而用any.遵守“主將從現(xiàn)”的原則。遵守“主現(xiàn)從現(xiàn)”的原則。Forexample:Ifyouhaveanyquestionstoask,pleasecometomyoffice.Exercise:練習(xí)Ⅰ.單項(xiàng)選擇（）1.Ifyou_____totheparty,you’llhaveagreattime.A.willgoB.wentC.goD.going（）2.I____hertheanswerifshe____me.A.cantell,willaskB.willtell,willaskC.wouldtell,askD.cantell,asks（）3.–Whatareyougoingtodotomorrow?--We’llgotothelibrarytomorrowifit___.A.isn’trainB.rainC.won’trainD.doesn’train（）4.Pleaseopenthewindowifyou_____

veryhotintheclassroom.A.feelB.feltC.feelingD.willfeel

（）5．I’llgivethebooktohimifhe___herenextSunday.A.willcomeB.comesC.iscomingD.cameⅡ.用所給詞的適當(dāng)形式填空6..Ifyou________(feel)tired,you_________(have)tohavearest.7.Where_______he______(see)thefilmifhe_________(have)time?8.Ifthere_______(be)fewertrees,there_________(be)morepollution.9.IfMarcia_________(live)alone,she________(keep)apetparrot.10.Lana________(buy)anewdressiftheoldone________(be)outofstyle.四.unless引導(dǎo)的條件狀語從句：“unless”意思是“如果不;除非;”相當(dāng)于''if...not''.unless引導(dǎo)的條件狀語從句主從句時(shí)態(tài)與if的一樣！Forexample:We’llgoforapicnicifitdoesn’trainthisSunday.===We’llgoforapicnicunlessitrainsthisSunday.Exercise:1.除非明天下雨，否則我將和你一起去公園的。Unlessit_____tomorrow,I________totheparkwithyou.2.除非我們?cè)琰c(diǎn)離開，否則不能準(zhǔn)時(shí)到。wecan’tgetthereontimeunlesswe_________earlier.

3.除非你更加小心點(diǎn)，否則你就會(huì)出事故。Unlessyou_______morecare,you_______anaccident.五.條件狀語從句和主句還有一個(gè)共同的伙伴，有時(shí)它可以代替從句和主句，它就是‘‘祈使句+and/or+簡(jiǎn)單句”。其中and表示句意順承；or則表示轉(zhuǎn)折，意思為“否則”。Forexample:1.Ifyouworkharder,you’llpasstheexam.==Workharderandyou’llpasstheexam.2.Ifyoudon’thurryup,you’llmissthetrain.==Hurryup,oryou’llmissthetrain.同義句轉(zhuǎn)換:

1.Studyhard,oryouwon’tpasstheexam.Ifyoustudyhard,you__________theexam.2.Takeataxi,andyou’llcatchthetrain._____you_____ataxi,you’llcatchthetrain.

3.Ifyougotobedearly,youwon’tfeeltiredinthemorning._______________early,_____youwon’tfeeltiredinthemorning.

4.Ifyoudon’tworkhard,yourteacherwillprobablybeangry.___________,_____yourteacherwillprobablybeangry.5.Breathedeeplyforoneminute,andyou’llfeelrelaxed._____you______deeplyforoneminute,you__________relaxe.一.概念：二.從句的位置：1）主句在前，從句在后，句末一個(gè)標(biāo)點(diǎn)符號(hào)。2）從句在前，主句在后，中間用逗號(hào)隔開。三.主從句的時(shí)態(tài)：1）主將從現(xiàn)。2）主現(xiàn)從現(xiàn)。（條件：從句有情態(tài)動(dòng)詞或是祈使句）四.unless引導(dǎo)的條件狀語從句：（====if...not....除非/如果...不....)五.與“祈使句+and/or+簡(jiǎn)單句”之間的轉(zhuǎn)換：

if條件狀語從句的時(shí)態(tài)練習(xí)_初中習(xí)題集

I.單項(xiàng)選擇1.Ifyou_____totheparty,you’llhaveagreattime.A.willgoB.wentC.goD.going2.Itwillbealongtime____peter_____hiswork.A.since,hasfinishedB.after,finishesC.when,willfinishD.before,finishes.3.whatwillfather_____usfromJapan?A.takeB.bringC.carryD.make4.Weifangisfamous______kitesA.forB.toC.onD.with5．I____hertheanswerifshe____me.A.cantell,willaskB.willtell,willaskC.wouldtell,askD.willtell,asks

6.–whatareyougoingtodotomorrow?--we’llgotothelibrarytomorrowifit___.A.isn’trainB.rainC.won’trainD.doesn’train7.—Doyouknowwhenhewillcomebacktomorrow?--sorry,Idon’tknow.whenhe____back,I’lltellyou.A.comesB.willcomeC.comeD.maycome8.whatwillyoudoifyou_____totheoldfolk’shomevisit?A.goB.wentC.goingD.willgo9.IfIeat____food,I’llbeveryfat.A.toomanyB.manytooC.toomuchD.muchtoo10.I’llgivethebooktohimifhe___herenextsunday.A.willcomeB.comesC.iscomingD.came11.There____anenglishfilminourschooltomorrow.A.isgoingtohaveB.willhaveC.isgoingtobeD.has12.Couldyoutelluswhere____？A.willthenextolympicgamesheldB.thenextolympicgameswillbeheldC.wouldthenextolympicgamesbeheldD.thenextolympicgameswouldbeheld13.Whenmymotherreturnedlastnight,I____abook.A.readB.amreadingC.wasreadingD.amgoingtoread14.What____you____whenitbegantorain?A.do,doB.were,doingC.are,doingD.did,do15.I’llwakeyouupwhenhe____back.A.willB.isgoingtocomeC.comesD.come

II、用所給詞的適當(dāng)形式填空1.Ifyou_______(feel)tired,you______(have)tohavea