初中語法之if條件狀語從句

初中語法之if條件狀語從句第一頁，共22頁。If從句（條件狀語從句）第二頁，共22頁。主句+if條件狀語從句

if條件狀語從句，+主句（從句后加逗號）if條件狀語從句要用一般現(xiàn)時(shí)。句型結(jié)構(gòu)時(shí)態(tài)If條件狀語從句第三頁，共22頁。IfI’mhungry,Iwill______________.IfI’m

tired,Iwill_____________.Lookandsayeatsomefoodhavearest第四頁，共22頁。IfI’mill,__________________.

IwillseeadoctorLookandsayIfI’mlate,_________________.Iwillsaysorry第五頁，共22頁。

Ifitrainstomorrow,I_____________________.willwatchTVathomeIfit_____________tomorrow,________________.I’llplaybasketballdoesn’trainIwon’t________________.playbasketball第六頁，共22頁。Ifyouarefreethisweekend,whatwillyoudo?IfIamfree,…sleepwatchTVplaycomputergamespractice第七頁，共22頁。grammarif條件狀語從句(2)句子特點(diǎn)：1.if從句中用一般現(xiàn)在時(shí)，表示未來的一種條件，從句中可以加時(shí)間狀語。2.當(dāng)if表示未來的條件時(shí)，主句中用一般將來時(shí)。句型結(jié)構(gòu)：主句+if條件狀語從句

if條件狀語從句，+主句（從句后加逗號）3.時(shí)態(tài)：if一般現(xiàn)在時(shí)，+主句一般將來時(shí)或（can/may/must+v.)第八頁，共22頁。e.g.1.Ifyoudon’tgetupearly,youwillbelateforschool.你如果不早點(diǎn)起床，上學(xué)就會(huì)遲到。2.IfIplaygamesonit,itwillgowrong.如果我用它玩游戲，它就會(huì)壞掉。3.Ifyoufinishthehomework，youcangohome．如果你作業(yè)做完了就可以回家了。4.Ifyouwanttoloseweightyoumust/shouldeatlessbread.如果你想減肥，你必須少吃面包。5.Ifyouheaticeitturnstowater.(也可用willturn)如果把冰加熱，它就會(huì)化成水。第九頁，共22頁。if條件句不一般,幾個(gè)要點(diǎn)記心間。條件句放在前,逗號要放句中間。條件句表可能,主句多用將來時(shí)；條件句表事實(shí),主句常用現(xiàn)在時(shí)。if條件句有特點(diǎn),現(xiàn)在時(shí)把將來替；這個(gè)規(guī)則要牢記!if條件句歌訣第十頁，共22頁。1.Ifhe____________(not,doit),I___________(do)it.2.Ifyou____(be)lateforschool,myteacher________(be)angry.arewillbe3Ifshe________(win)theprize,we_______(be)happy.winswillbe4.IfI_________(not,eat)somuch,I_________(get)thinner.5.Ifyou______(tell)them,they_____________(not,believe)you.don’teatwillgettellwon’tbelieve6I_________(stay)athome,Ifit__________(rain).7.Ifit____________(not,rain),I_________(go)out.8.we__________(play)football,Ifitis_________(sun).9.Ifshe__________(become)astar,herparents____________(not,send)heraway

10.He_________(watch)TV,ifhe______(be)free.willstayrainsdoesn’trainwillgowillplaysunnybecomeswon’tsendwillwatchisdoesn’tdowilldoExerciseTime第十一頁，共22頁。---I’malwaystiredinthemorning.---Ifyougotobedearly,youwon’tbetiredinthemorning.Givingsuggestions:第十二頁，共22頁。---IgetthirstywhenIrun.---Ifyoutakesomewaterwithyou,youwon’tgetthirstywhenyourun.第十三頁，共22頁。Iworrysomuchaboutmyschoolwork.---Ifyoualways

workhard,youwon’tworryaboutyourschoolwork.Youshould

workhard!第十四頁，共22頁。Unit3activity1Rewritethesentenceswithif:Listeninclass,oryouwon’tunderstandwhattodo.Ifyoudon’t

listeninclass,youwon’tunderstandwhattodo.1)Eatsomebreakfast,oryou’llgethungryatschool.2)Hurryup!We’llbelate!3)Readtheinstructionscarefully.Thenyou’llknowwhattodo.Ifyoudon’teatsomebreakfast,you’llgethungryatschool.Ifyoudon’thurryup,we’llbelate.Ifyoureadtheinstructionscarefully,you’llknowwhattodo.第十五頁，共22頁。Activity2.Completethesentences—Iwanttogethighscores.—If__________________________(workhard/dowell)youworkhard,youwilldowell.1.-howcanIremembermyfriends’birthdays?-If_______________________________________(keepanoteinyourdiary/notforget).2.-It’slate,butIdon’twanttogotosleep.-If_______________________________________(notgetenoughsleep/feeltiredatschool).youkeepanoteinyourdiary,youwon’tforget.youdon’tgetenoughsleep,you’llfeeltiredatschool.第十六頁，共22頁。3.-Idon’tlikespeakingEnglishoutsidetheclassroom.-If_______________________________________(notpractice/notimprove).4.-ShouldItellmyteacherIdon’tunderstandthehomework?-If_______________________________________(nottellher/shenotabletohelpyou).5.-IsitOKifIwatchTVforsixhours?-If_______________________________________(youwatchtoomuch/eyeshurt).youdon’tpractice,youwon’timprove.youdon’ttellher,shewon’tbeabletohelpyou.youwatchtoomuchTV,youreyeswillhurt.第十七頁，共22頁。summaryif的用法2.引導(dǎo)條件狀語從句：譯為“如果，假如”(1)if從句+祈使句(2)if從句+主句（一般將來時(shí)）1.引導(dǎo)賓語從句：譯為“是否”，表示不確定的概念。Idon’tknowifyourfathercancometogether.Canyoutellmeifmissyourparents?第十八頁，共22頁。e.g.IfIwereyou,Iwouldinvitehimtotheparty.如果我是你，我會(huì)邀請他參加聚會(huì)。Ifhehadhurried,hecouldhavecaughtthetrain.如果他抓緊點(diǎn)，他會(huì)趕上火車的。IfIweretogoabroad,IwouldgotoAmerica.如果我出國了，我會(huì)去美國。3.非真實(shí)條件句（虛擬語氣）：表示不可實(shí)現(xiàn)的條件或根本不存在的條件。從句多用一般過去時(shí)或過去完成時(shí)，表示對現(xiàn)在或過去的一種假設(shè)。第十九頁，共22頁。()6.─Mikewantstoknowif____apicnictomorrow.─Yes.Butifit_______,we'llvisitthemuseuminstead.A.youhave/willrain

B.youwillhave/willrain

C.youwillhave/rains

D.willyouhave/rains()7.Ireallydon'tknowifshe_______itwhenshe________.

A.finds/arrives

B.finds/willarrive

C.willfind/willarrive

D.willfind/arrives（）4.Idon’tknowif______tomorrow.A.itdoesn’trainB.therainwillstopsC.therainswon’tstopD.itwon’train（）5.Thevolleyballmatchwillbeputoff(推遲）ifit______.A.willrainB.rainsC.rainedD.israining（）1.Becareful,ifyou______