八年级下册unit6 Section A-2

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1、1Unit6Anoldmantriedtomovethemountains.SectionAGrammarFocus2Howdoesthestorybegin?Whathappenednext?WhywasYuGongtryingtomovethemountains?WhoistheMonkeyKing?Whatcan'ttheMonkeyKingdo?Onceuponatime,therewasaveryoldman...GrammarFocus3Assoonasthemanfinishedtalking,YuGongsaidthathisfamilycouldcon

2、tinuetomovethemountainsafterhedied.Becausetheyweresobigthatittookalongtimetowalktotheotherside.HeisthemaincharacterinJourneytotheWest.Hecannotturnhimselfintoapersonunlesshecanhidehistail.4Conditionalclauseswithifandunless含有if的复合句由两个分句组成；if为连词，引导条件状语从句，另一句为主句。如果谈论的是某一个动作发生后势必会产生某个结果，那么主从句

3、都用一般现在时态。e.g.Ifyouboilwater,itbecomessteam.Ifyoudropaglass,itbreaks.Ifyouheatmetal,itmelts.Ifyourun,yousweat.Ifyouputwoodintowater,it__________(float).floatsUnless的用法5如果谈论的是‘如果’某一个动作或事情发生后，很可能将会产生某种结果，那么在复句中主句的动词用一般将来时，而if从句仍然是一般现在时。e.g.Ifitrains,wewon’ttakeahiketomorrow.Hewillgetupschoo

4、lontimeiftheclockgoesoff.IfhearrivesinHongKong,hewillcallme.Ifyoudon’tstartearly,you____________thebeginningofthefilm(miss)willmiss6●若if条件句放句首，从句后面要加逗号，和主句隔开。●unless与if用法相似，相当于if…note.g.Youwillfailtheexamifyoudon’tprepareforit.→Youwillfailtheexamunlessyouprepareforit.Ifhedoesn’tlookupthe

5、wordinthedictionary,hewon’tknowitsmeaning.→Hewon’tknowtheword’smeaningunlesshelooksitupinthedictionary.Shewillmissthetrainunlessshe_______upearly.gets7if和unless的用法一般情况下，unless相当于if…not，可以互换。用一般现在时代替将来时。Iwon'tletyouinunlessyoushowmeyourpass=Iwon'tletyouinifyoudon'tshowmeyourpass.如果你不出示通行证

6、，我就不让你进来。如果主句描述的是情感或情绪活动方面的内容，if…not结构不能换成unless。如：I'llbequitegladifshedoesn'tcomethisevening.她今晚如果不来我很高兴。1.Unless you take more care, you’ll have an accident.如果不多加小心的话，你会出事故的。82.My baby sister never cries unless she is hungry.我那刚出生的妹妹除非饿了，否则她是从来不哭的。3. Don’t promise anything unless you’r

7、e 100 percentsure.不要作任何的许诺,除非你有百分百的把握。4. Unless bad weather stops me, I jog every day.(除非坏天气作梗，每天我都慢跑。)误:Don'tcomeinunlessyouwillbeinvitedto.正:Don'tcomeinunlessyou'reinvitedto.误:Unlesshewillcome,wewon'tbeabletogo.正:Unlesshecomes,wewon'tbeabletogo.9Assoonas的用法英语动词的时间大致可分为三