《九年级英语专题复习：状语从句.ppt》由会员分享，可在线阅读，更多相关《九年级英语专题复习：状语从句.ppt（11页珍藏版）》请在三一办公上搜索。
1、初三英语专题复习之,状语从句,一、概念1.定义：在主从复合句中，用于修饰主句中动词、形容词或副 词的句子，叫状语从句。2.类型：状语从句按其在句中的作用分为：时间、地点、原因、目的、结果、条件、方式、让步、比较状语从句九类。3.位置：由从属连词引导，可位于主句前，亦可位于主句后。位于句首时，用逗号与其后的主句隔开。二、时间状语从句 引导时间状语从句的连接词有：when,as,while,after,before,since,as soon as,till,until等。要根据连词的不同意义来推断主句的谓语动词的时态。在时间状语从句中，通常用一般现在时代替一般将来时。eg:(1)What are
2、 you going to do when you grow up?（一)when,while,as引导的时间状语从句 1.when=at the time that“当（在）时”，可表示瞬间、时间段，主从句所述动作、事情可同时，也可以有先后。,eg:(2)It was snowing when we got to the airport.我们到达机场时，天正在下雪。（同时发生)(3)He went home when he had finished his homework.做完作业之后他回家去了。（先后发生）2.while=for as long as/during the time th
3、at“正当（正在)时”用于同时进行的两延续性动词相伴随而发生，常对同类的两动 作进行对比：eg:(4)Please write while I read.(=during the time that)我念的时候请写下来。(5)I am safe while I am here.(=for as long as)只要我在这儿，我就安全。(6)Some students were reading while others were writing.有些学生在读，而有些学生在写。（进行对比）3.as=at the same time“当时”(1)不指先后，而指并相发生，尤指短动作或事件同时发生.,e
4、g:(7)As I looked,some one came near.正当我看时，有个人走上前来。(2)说明两种正在发展或变化的情况.eg:(8)As I get older I get more optimistic.我越活越乐观。as/when/while均可引导时间较长的“背景”情况：eg:(9)As(When/While)I was walking down the street，I noticed a police car in front of Number 37.我顺着马路往前走，发现37号门前停着一辆警车。（二）before引导的时间状语从句通常表示主句的动作发生在从句 的动
5、作之前，之后用after.eg:(10)Please turn off the light before you leave the room.请你在离开房间之前把灯关掉。(11)You can watch TV after you finish homework.做完作业之后，你可以看一下电视。,（三）until/till 均表示主句的谓语动词（延续性动词）一直延续到 until/till 所表示的时间为止。1.肯定句中，二者可以通用。eg:(12)You may stay here until/till the rain stops.你可以在这儿呆到雨停。2.否定句中，表示主句的谓语动词（
6、非延续性动词）直到until所 表示的时间才发生。构成句式 not.until，有时不用not，也 可以用如never,nothing 等表示否定的词。这里不能用 till。eg:(13)He didnt go to bed until he had finished his work.他直到完成工作才去睡觉。3.till 不用于句首，也不可用于强调句。eg:(14)Until he joined the army,he worked in that factory.他在那家工厂上班直到参军。(15)Until he told me,I knew Tom had been ill for a
7、week.知道他告诉我，我才知道汤姆病了一个星期了。,（四）since 引导的时间状语从句，表示“自以来”，主句用现在完成时，从句用一般过去时。eg:(16)I have worked in this company since I graduated from college.我从大学毕业后，一直在这家公司上班。（五）as soon as引导的从句都表示从句的动作一发生，主句的动作随即就发生，意为“一就”。这类从句中，经常用一般现在时代替一般将来时。eg:(17)As soon as he arrives,Ill tell him.他一到，我就告诉他。三、地点状语从句 地点状语从句由 whe
8、re,wherever 引导。eg:(18)Where there is a will,there is a way.有志者，事竟成。四、原因状语从句 表示理由或原因的状语从句，常用连词 because,since和 as。这三个词所表达的语气由 because 到 as 逐渐减弱。由 why 提出问题用 because 回答。,eg:(19)I lent him my bike because he needed it.我把我的自行车借给了他，因为他需要。(20)Lets begin our meeting since everybody is here.既然大家都到齐了，咱们就开始开会吧。
9、五、目的状语从句（一）引导目的状语的词或词组有：so that,so,in order that等,谓语含有may,might,can,could,will,would等情态动词。eg:(21)He must get up early so that he can catch the first bus.他必须早点起床以便赶上第一班车。（二）当从句与主句主语一致时，可用 so as to,in order to.eg:(22)He worked day and night in order that he could succeed.=He worked day and night in or
10、der to succeed.他日夜工作想要获得成功。六、结果状语从句 引导结果状语从句的词或词组有：so,so that,sothat,suchthat.,eg:(23)The question is so hard that I cant work it out.=The question is _ hard for me _work it out.=The question is _ easy _ for me _work it out.这道题如此难以至于我没做出来。七、条件状语从句（一）条件状语从句通常由 if（假如），as long as（只要）,unless（除非）来引导，主句为祈
11、使句、一般将来时、或有情态动词时 从句用一般现在时。eg:(24)You will not pass the exam unless you study hard.=_you dont study,you wont pass the exam.=Study hard,_ you wont pass the eaxm.除非你努力学习，否则你将不能通过考试。（二）如果 if引导的条件状语从句所表达的前提或条件将来可以实现或正在进行，动词要用现在完成时或进行时，主句通常用将来时。,too,to,not,enough,to,If,or,eg:(25)Ill show you how to do it
12、if I have finished the book.如果我读完了这本书，我就告诉你怎么做。（三）“祈使句+and/or/or else”引导的结果状语从句，祈使句在意义上相当于条件状语从句。eg:(26)Use your head,and youll find a way.=_ you use your head,youll find a way.动动脑筋，你就会想出办法来。八、方式状语从句 方式状语从句用以描述主句动作的方式，通常由 as（按照），as if/as though（好像）等引导。eg:(27)I will do it as you tell me.我将按照你告诉我的去做。九
13、、让步状语从句 让步状语从句表示某种与主句相反的条件或情况，但从句所表示的这些不利因素并不能阻止主句动作的发生，在相反的条件下，主句的情况依然存在。让步状语从句的引导词有：though/although(虽然）,even though（尽管），Whoever/no matter who(无论谁）,however/no matter how（无论怎样）,whatever/no matter what（无论什么）,Wherever/no matter where（无论哪里）,whenever/no matter when（无论何时）和 as（虽然）等，但主句不能再用 but。eg:(28)He d
14、idnt turn on the lights,though it was dark outside.虽然里面很暗，但他没有开灯。,If,十、比较状语从句 比较状语从句常用的从属连词为 asas（和一样）,not as/soas（和不一样）,than（比）,the morethe more（越越）eg:(29)Jim is as tall as me/I am.(30)She doesnt speak English as/so well as Mary(does).=She speaks English _ than Mary(does).=Mary speaks English _ tha
15、n her/she does.(31)The _(much)you practice English,the _(well)you learn it.Exercises()1.I have been collecting coins _ I was 11 years old.A.for B.since C.when D.after()2.He worked _ hard _ he passed the exam.A.such,that B.so,that C.as,as D.too,to,worse,better,more,better,B,B,()3.Is Jim at school tod
16、ay?-Yes,_ he has a bad cold.A.because B.so C.though D.as()4.Over 400 million people have visited Disneyland parks around the world _ American Disneyland opened in July 1995.A.after B.before C.till D.since()5.James with the Greens _ the White Tower Park if it _ tomorrow.A.are going to,isnt rainy B.ar
17、e going to,doesnt rain C.is going to,wont rain D.is going to,isnt rainy()6.I wonder if it _ tomorrow.If it _,Ill go hiking with Jim.A.will rain,wont rain B.rains,wont rain C.will rain,doesnt rain D.rains,doesnt rain()7.He got up early this morning _ he could catch the early bus.A.so B.in order that C.though D.in order to,C,D,D,C,B,
