初中英語(yǔ)if條件句

PAGE4定義：常見(jiàn)的if條件狀語(yǔ)從句表示在某條件下，某事很可能發(fā)生，條件是可能存在的，主句中某種情況發(fā)生的概率也是很高的。E.g.Ifyouaskhim，hewillhelpyou．如果你請(qǐng)他幫忙，他會(huì)幫你的。E.g.Ifyoufailintheexam，youwilllethimdown．如果你考試不及格，你會(huì)讓他失望的。E.g.Ifyouhavefinishedthehomework，youcangohome．如果你作業(yè)做完了就可以回家了。另外，if從句還表示不可實(shí)現(xiàn)的條件或根本不可能存在的條件，也就是一種虛擬的條件或假設(shè)。從句多用一般過(guò)去時(shí)或過(guò)去完成時(shí)，表示對(duì)現(xiàn)在或過(guò)去的一種假設(shè)。E.g.IfIwereyou，Iwouldinvitehimtotheparty．如果我是你，我會(huì)邀請(qǐng)他參加聚會(huì)。E.g.IwouldhavearrivedmuchearlierifIhadnotbeencaughtinthetraffic．要不是交通堵塞，我本會(huì)來(lái)得早一些。另外你還要注意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(lái)時(shí)E.g.Ifherunshe’llgetthereintime.如果他用跑的，他就會(huì)及時(shí)趕到那兒。E.g.Thecatwillscratchyouifyoupullhertail.如果你拉貓的尾巴，它就會(huì)抓你。2．if從句用一般現(xiàn)在時(shí)，主句用may/might/canE.g.Ifthefoggetsthickertheplanemay/mightbediverted.如果霧在大一些，飛機(jī)可能就會(huì)改在別的機(jī)場(chǎng)降落。E.g.Ifitstopssnowingwecangoout.如果雪停了，我們就可以出去。3．if從句用一般現(xiàn)在時(shí)，主句用must/shouldE.g.Ifyouwanttoloseweightyoumust/shouldeatlessbread.如果你想減肥，你必須少吃面包。4．if從句用一般現(xiàn)在時(shí)，主句用一般現(xiàn)在時(shí)E.g.Ifyouheaticeitturnstowater.(也可用willturn)如果把冰加熱，它就會(huì)化成水。5．if從句用現(xiàn)在進(jìn)行時(shí)，主句用一般將來(lái)時(shí)E.g.IfyouarelookingforPeteryou’llfindhimupstairs.如果你是在找彼得，上樓就會(huì)找到他。6．if從句用現(xiàn)在完成時(shí)，主句用一般將來(lái)時(shí)E.g.IfyouhavefinisheddinnerI’llaskthewaiterforthebill.如果你吃完了，我就叫服務(wù)生來(lái)算賬注意：學(xué)習(xí)"if"引導(dǎo)的條件狀語(yǔ)從句的用法,現(xiàn)在總結(jié)一下:if條件句不一般,幾個(gè)要點(diǎn)記心間;條件句,放在前,逗號(hào)要放句中間。條件句表可能，主句多用將來(lái)時(shí)；條件句表事實(shí)，主句常用現(xiàn)在時(shí)。在if引導(dǎo)的條件狀語(yǔ)從句中，如果從句談?wù)摰氖且粋€(gè)有可能發(fā)生的事實(shí)及其產(chǎn)生的相關(guān)的結(jié)果，主句用一般將來(lái)時(shí)態(tài)，從句用一般現(xiàn)在時(shí)態(tài)。如：E.g.Wecanwalkthereifwecan'tfindabus.E.g.Ifitrainstomorrow,wewillnotgotothezoo.E.g.Whatwillyoudoifyoufindapandaindanger.如果if條件句談?wù)摰氖侵貜?fù)發(fā)生和預(yù)示要發(fā)生的情景和事件，則主從句大多用一般現(xiàn)在時(shí)態(tài)。E.g.Ifbearsareindanger,theyattackpeople.在if引導(dǎo)的條件狀語(yǔ)從句中，if和條件句位置靈活，可直接放在主句后面，若if條件句放句首，從句后面要加逗號(hào)，和主句隔開(kāi)。還要注意前后時(shí)態(tài)一致原則【經(jīng)典練習(xí)】一.單項(xiàng)選擇（）1.Ifyou_____totheparty,you’llhaveagreattime.A.willgo

B.went

C.go

D.going（）2.Itwillbealongtime____Peter_____hiswork.A.since,hasfinished

B.after,finishes

C.when,willfinish

D.before,finishes.（）3.Whatwillfather_____usfromJapan?A.take

B.bring

C.carry

D.make（）4.Weifangisfamous______kites.三．翻譯句子1.如果他到的晚了會(huì)發(fā)生什么事情？What_______________ifhe_____________late?2.如果努力學(xué)習(xí)，你就會(huì)取得好成績(jī)。Ifyou___________________,you___________good_____________.3.他如果看電視太久了，他的父母會(huì)不高興。

Ifhe_________TVtoomuch,hisparents____________________unhappy.4.如果我們?yōu)樗M織生日聚會(huì)，大家都會(huì)來(lái)的。

Everyone________________ifwe_____________abirthdayparty__________him.5.如果明天不下雨，我會(huì)和你一起去公園的。

Ifit__________

__________tomorrow,I______________gotothepark_________you.6.如果她睡過(guò)頭了，就會(huì)旅游遲到的。

She__________________________thetripifshe___________________.7.如果他有空，他會(huì)幫助你的。Ifhe_________________,he_________________

you.8.如果Tom考試不及格，他就沒(méi)有機(jī)會(huì)上高中了。Tom_________havethe________togotothe________highschoolifhe________theexams.1.Ifshe______________(notget)homeontime,hermomwillbeworried.2.IfTomworkshard,he_____________(make)alotofmoney.3.IfIstudyhard,mydream___________(實(shí)現(xiàn)).4.Ifhe____________(爭(zhēng)論)hisfriend,hewillbeverysad.5.Ifyoufightwithyourbrother,what_____________(發(fā)生)?6.Callmeifhe________________(回來(lái)).7.Hecanmakegreatprogressifhe____(追隨，聽(tīng)從)myadvice.()8.IfIfindhisphonenumber,I______you.A.tellB.toldC.willtellD.havetold()9.I__theCDstoyouifIhavetimetomorrow.A.willreturnB.returnedC.havereturnedD.return()10.ThestudentswillgototheSummerPalaceifit________tomorrow.A.won'train

B.isn'training

C.doesn'train

D.isn'train()11.Iwon’twatchtheTVplayifmyfather___medomyhomework.A.let

B.willlet

C.won’tlet

D.lets()12.Ifyou___quiet,I’lltellyouwhathappened.A.willB.areCaretobeD.be()13.Ifyougototheparty,you___agoodtime.A.wouldhaveB.haveC.willhaveD.had()14.Don’tworry.Peterwillcallyouassoonashe_____London.willgettoB.getstoC.gettoD.gotto()15.Hedoesn’ttellmewhenhe____.I’lltelephoneyouassoonashe_____.A.willcome,comesB.willcome,willcomeC.comes,willcomeD.comes,comes()16.--Idon’tknowifDr.White______tothepartynextweek.–Ithinkhewillcomeifhe______es;willcomeB.willcome;willbeC.comes