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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(可能会发生的事情)主现从现(肯定会发生/祈使句)1.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。
2、_______________________________________________Ifyouhaveanyproblems,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=if...notE.g.Ifyoudon'tstudyhard,youwillnotpasstheexam.=Unlessyoustudyhard,youwillnotpasstheexam.除非你努力工作，否则你不会得到高工资。（hig
3、hsalary）。___________________________________________________________________________________________________________________3.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or否则）1.)Workhard,andyouwillgetahighsalary.=Ifyouworkhard,youwillgetahighsalary.2.)Workhard,oryouwillnotgetahighsalary.=Unlessyouwo
4、rkhard,youwillnotgetahighsalary.=Ifyoudon'tworkhard,youwillnotgetahighsalary.练习一．在正确的答案下划一条线。1.Daina(willgo/go/goes)toEuropeifshe(willpass/pass/passes)theexams.2.Thegraduates(willteach/teach/teaches)inthepoorvillageiftheMinistryofEducation(willagree/agree/agrees)soon.3.Ifthere(willbe/are/is)aca
5、raccident,they(willcall/call/calls)110forhelpatonce.4.Ifit(won’t/don’t/doesn’t/isn’t)rainy,we(willtake/take/takes)walkoutside.5.IfaUFO(willland/land/lands)infrontofme,I(willgo/go/goes)intolookforthealien.6.Ifhe(willhave/have/has)money,he(willbulid/build/builds)asciencelab.7.Don’twaitformeifI(am
6、/willbe)late.8.They(won’t/don’t)gotothebeachifit(willrain/rain/rains).9.I(willcall/call)youifhe(willstay/stay/stays)athome.10.MrSmith(willlet/let/lets)youknowifhe(willneed/need/needs)help.11.(Will/Do/Does)hevisitthemuseumifhe(won’t/don’t/doesn’t)get tired?12.Where(will/do/does)theyliveifthey(wi
7、llmiss/miss/misses)thebus?二、用所给词的适当形式填空1.Ifyou________(feel)tired,you_______________(have)tohavearest.2.Where_______he_________(see)thefilmifhe________________(have)time?3.Ifthere__________(be)fewertrees,there_______________(be)mo
