新人版英语八年级下册Unit6语法ppt课件.ppt

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 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，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.Unless,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,