If從句（條件狀語從句）Completethesentenceswiththecorrectformofthewords.1.Ifyou_______(listen)tothemusic,_____(buy)aCD.2.Ifhe______(be)lateforschool,______(notwait)forhim.3.Ifyou____(buy)anewcamera,____(get)agoodone.4.Ifthelight____________(notcome)on,____(wait)foroneminute.isbuygetdoesn’tcomewaitdon’twaitlistenbuyRevisionRevision祈使句+if條件狀語從句

if條件狀語從句，+祈使句（從句后加逗號）if條件狀語從句要用一般現在時。句型結構時態If條件狀語從句（1）Let’ssingthesonginChinese:IfyouarehappyWhatwillyoudoifyou’rehappy?IfI’mhappy,Iwill____________.IfI’mhappy,Iwill____________.IfI’mhappy,Iwill____________.IfI’mhappy,Iwill______________.clapmyhandsstampmyfeetwinkmyeyesnodmyheadIfI’mhungry,Iwill______________.IfI’m

tired,Iwill_____________.LookandsayeatsomefoodhavearestIfI’mill,__________________.

IwillseeadoctorLookandsayIfI’mlate,_________________.Iwillsaysorry

Ifitrainstomorrow,I_____________________.willwatchTVathomeIfit_____________tomorrow,________________.I’llplaybasketballdoesn’trainIwon’t________________.playbasketballIfyouarefreethisweekend,whatwillyoudo?IfIamfree,…sleepwatchTVplaycomputergamespracticegrammarif條件狀語從句(2)句子特點：1.if從句中用一般現在時，表示未來的一種條件，從句中可以加時間狀語。2.當if表示未來的條件時，主句中用一般將來時。句型結構：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.時態：if一般現在時，+主句一般將來時或（can/may/must+v.)e.g.1.Ifyoudon’tgetupearly,youwillbelateforschool.你如果不早點起床，上學就會遲到。2.IfIplaygamesonit,itwillgowrong.如果我用它玩游戲，它就會壞掉。3.Ifyoufinishthehomework，youcangohome．如果你作業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，它就會化成水。if條件句不一般,幾個要點記心間。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；條件句表事實,主句常用現在時。if條件句有特點,現在時把將來替；這個規則要牢記!if條件句歌訣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---I’malwaystiredinthemorning.---Ifyougotobedearly,youwon’tbetiredinthemorning.Givingsuggestions:---IgetthirstywhenIrun.---Ifyoutakesomewaterwithyou,youwon’tgetthirstywhenyourun.Iworrysomuchaboutmyschoolwork.---Ifyoualways

workhard,youwon’tworryaboutyourschoolwork.Youshould

workhard!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.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.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.summaryif的用法2.引導條件狀語從句：譯為“如果，假如”(1)if從句+祈使句(2)if從句+主句（一般將來時）1.引導賓語從句：譯為“是否”，表示不確定的概念。Idon’tknowifyourfathercancometogether.Canyoutellmeifmissyourparents?e.g.IfIwereyou,Iwouldinvitehimtotheparty.如果我是你，我會邀請他參加聚會。Ifhehadhurried,hecouldhavecaughtthetrain.如果他抓緊點，他會趕上火車的。IfIweretogoabroad,IwouldgotoAmerica.如果我出國了，我會去美國。3.非真實條件句（虛擬語氣）：表示不可實現的條件或根本不存在的條件。從句多用一般過去時或過去完成時，表示對現在或過去的一種假設。()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.r