新人版英语八年级下册Unit6语法ppt课件.ppt

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1、Unit6 语法专项课件（unless,as soon as,sothat的用法）,初中英语人教版八年级下册,unless的常见用法,unless引导条件状语从句，意为“除非，如果不”。unless=if not。,Youll fail in English unless you work hard.Well miss the bus unless we walk more quickly.,as soon as的常见用法,as soon as引导时间状语从句，意为“一就”。引导时间状语的连词包括when,while,until,till,before,after等。,As soon as I

2、 have finished,Ill give you a call.Ill write to you as soon as I get to Beijing.,sothat的常见用法,1.so形容词或副词that.引导肯定的结果状语从句，意思是“如此以致于”。,2.so形容词或副词that.引导否定的结果状语从句，意思是“如此以致于不能”。,The sunshine is so nice that I want to go swimming.,sothat,The camera is so expensive that I cant afford it.,易错点1,在时间状语从句和条件状语从

3、句中，应该使用一般现在时代替一般将来时，简称“主将从现”原则。,unless/as soon as引导状语从句的“主将从现”原则,主祈从现,主情从现,易错点1,Well be late unless we speed up.Ill return the book as soon as I finish it.,（主将从现）,（从现）,易错点1,Please call me as soon as you get there.,（主祈从现）,（从现）,易错点1,（主情从现）,You cant pass the exam unless you study hard.,（主情）,易错点2,一般情况下，

4、unless相当于ifnot，可以互换，遵循“主将从现”原则。,I wont let you in unless you show me your pass.,unless与ifnot,I wont let you in if you dont show me your pass.,易错点3,结构不一样,so that/sothat的区别,so that后跟句子（目的状语从句/结果状语从句）sothat的结构为：so形容词或副词that从句,易错点3,so that引导结果状语从句（因此、所以）或目的状语从句（以便、为了）。sothat只可以引导结果状语从句（如此以致于）。,表达含义不一样,易

5、错点3,The speaker speaks loudly so that all of us can hear him.Maria likes this dress so that she decides to buy it at once.,The boy ran so fast that I couldnt catch him.,(目的状语从句),(结果状语从句),(结果状语从句),【典例1】_ youve tasted them,you cant imagine how delicious the dishes are.A.Because B.Although C.When D.Unl

6、ess,考查连接词。句意：如果你不尝一尝，你就想象不到这些菜有多美味！because因为，although尽管，when当时候，unless如果不，根据题意只能选unless。,【典例2】As soon as he returns to hometown,he _ his grandparents.A.visit B.visits C.will visit D.visited,考查连接词as soon as的用法。句意：他一回到家乡，就去看望他爷爷奶奶了。as soon as引导的从句“主将从现”，主句选一般将来时will visit。,【典例3】David was _ careless _ he didnt find the mistakes in his test paper.A.too;to B.so;that C.such;that D.so;/,考查状语从句。句意：大卫如此粗心以致于他根本没有发现考试卷子中的错误。根据句意，前后两个句子为前因后果，故答案选B。,知识回顾Knowledge Review,