sectionAgrammarsectionAgrammarsectionAgrammarsectionAgrammar八下英语八下英语Unit6AnoldmantriedtoUnit6Anoldmantriedtomovethemountains.movethemountains.八下英语八下英语Unit6AnoldmantriedtoUnit6Anoldmantriedtomovethemountains.movethemountains.Howdoesthestorybegin?Whathappenednext?WhywasYuGongtryingtomovethemountains?WhoistheMonkeyKing?Whatcan'ttheMonkeyKingdo?Onceuponatime,therewasaveryoldman...GrammarFocusGrammarFocusAssoonasthemanfinishedtalking,YuGongsaidthathisfamilycouldcontinuetomovethemountainsafterhedied.Becausetheyweresobigthatittookalongtimetowalktotheotherside.HeisthemaincharacterinJourneytotheWest.Hecannotturnhimselfintoapersonunlesshecanhidehistail.Conditionalclauseswithifandunless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Unless的用法如果谈论的是‘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.Hewillgetupschoolontimeiftheclockgoesoff.IfhearrivesinHongKong,hewillcallme.Ifyoudon’tstartearly,you____________thebeginningofthefilm(miss)willmiss●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’tlookupthewordinthedictionary,hewon’tknowitsmeaning.→Hewon’tknowtheword’smeaningunlesshelooksitupinthedictionary.Shewillmissthetrainunlessshe_______upearly.getsif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，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...
