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1、条件状语从句引导词：if（如果）,unless（除非）,incase（以防）时态：主将从现（可能会发牛的事情）主现从现（肯定会发生/祈使句）l.if引导的条件状语从句，可位于前面或后面，但是如果放在后面，主从句用逗号隔开。e.g.IwillcallyouifIcome.或IfIcome,Iwillcome.（主将从现）如果明天不下雨，我们将去野炊。Ifyoudropthevase,itfallsintopieces.（主现从现）如果你摔花瓶的话，它就会变成碎片。如果你把水冷却的话，它就会变成冰。Ifyou
2、haveanyproblems,pleasecallme.如果你知道答案，请举手。2.unless引导的条件状语从句，位置和if引导的一样。Unless二if...notE.g.Ifyoudoiftstudyhard,youwillnotpasstheexam.=Unlessyoustudyhard,youwillnotpasstheexam.除非你努力工作,否则你不会得到高工资。(highsalary)o3•条件状语从句和祈使句之间的转换。结构：祈使句，and/or+从句(and:那么oi•否则)1.)
3、Workhard,andyouwillgetahighsalary.=Ifyouworkhard,youwillgetahighsalary.2.)Workharderyouwillnotgetahighsalary.=Unlessyouworkhard,youwillnotgetahighsalary.=Ifyoudonrtworkhard,youwillnotgetahighsalary.练习一.在正确的答案下划一条线。1.Daina(willgo/go/goes)toEuropeifshe(will
4、pass/pass/passes)theexams.2.Thegraduates(willteach/teach/teaches)inthepoorvillageiftheMinistryofEducation(willagree/agree/agrees)soon・3・Ifthere(willbe/are/is)acaraccident,they(willcall/call/calls)110forhelpatonce.4.Ifit(worTt/dorft/doesiV"isn't)rainy，we(w
5、illtake/take/takes)walkoutside.5.IfaUFO(willland/land/lands)infrontofme,I(willgo/go/goes)intolookforthealien.4.Ifhe(willhave/have/has)money,he(willbulid/build/builds)asciencelab.5.Don5twaitformeifI(am/willbe)late.6.They(won^t/don't)gotothebeachifit(willra
6、in/rain/rains).7.I(willcall/call)you讦he(willstay/stay/stays)athome.8.MrSmith(willlet/let/lets)youknow讦he(willneed/need/needs)help.11・(Will/Do/Does)hevisitthemuseumifhe(worft/don"/doesn't)gettired?12.Where(will/do/does)theyliveifthey(willmiss/miss/misses)t
7、hebus?二、用所给词的适当形式填空I.Ifyou(feel)tired,you(have)tohavearest.2.Wherehe(see)thefilmifhe(have)time?3.Ifthere(be)fewertrees,there(be)morepollution.4.He(dress)morecasuallyifhe(notwork)onweekends.5.IfMarcia(live)alone,she(keep)apetparrot.6・Lana(buy)anewdressifth
8、eoldone(be)outofstyle・7.Thetwins(fight)ifthey(argue).8.1(have)abakesaleifI(need)moneyforeducation.9.Peter(send)meabeautifulsouvenirifhe(tour)Spain.10-IfMrGreen(say)Iamhard-working,myparents(feel)glad.II.1(go)tothebe
