lesson19.3原因等状语从句.ppt

Adverbial clauses: cause, result and purpose 原因,结果和目的状语从句 1.I went to the library because I was looking for a book about English. 2.As I havent studied, I wont pass this exam. 3.Since you dont know any French, you wont understand this film. 4.You must study hard, for you are a student. 一.原因状语从句:在整个句子中表示原因的状语从句 叫原因状语从句.引导原因状语从句的从属连词有 because,as,since和并列连词for.注意以下几点: 1.这几个从属连词中,语气最强的是because. 在回答问题时,只能用because引导原因状语从句.如: 你昨天为什么没有来上课? 因为我病了. Why didnt you come to school yesterday? Because I was ill. 2.for 在四个从属连词中语气最弱,它通常用来表示 一个补充说明的理由.它引导的状语从句只能位于句末. 如: 昨天晚上一定下了雨,因为地上是湿的. It must have rained last night, for the ground is wet. 3.特别要注意的是,表示原因的连词不可与并列连词so同 时使用在一个句子中.如: 因为昨天雨下得很大,所以我没有去看电影. Because it rained heavily yesterday, (so) I didnt go to the cinema. x 1.It is so cold that the lake has frozen over. 2.She was in such a hurry that she forgot to turn off the light in the house. 3.He is such a young boy that he cant go to school by himself. 二.结果状语从句:结果状语从句的两个常用结构是 suchthat和so that.这两个句型都可来表示 “如此.以致于”.so 的后面接形容词或者副词, such的后面则要接名词.具体来说,使用这两个结构时, 应注意: 在sothat 这个句型中,so的后面常接: 1.形容词/副词: 如:他太小了,还不能参军. He is so young that he cant join the army. 他跑得太快了,没有一个人能赶得上他. He runs so fast that no one can catch up with him. 2.形容词+不定冠词+单数名词.如: 他很诚实,我们都很信任他. He is so honest a boy that we all believe him. 3.表示数量的形容词(much,little, few,many)+ 复数名词或不可数名词.如: 他从来就没有见过这么多钱,以致于不知道该怎么办才好. 我从没有见过这么多美丽的鲜花,我几乎不能望前走一步. He had never seen so much money that he didnt know what to do. I had never seen so many beautiful flowers that I can hardly move a step forward. 在suchthat 这个句型中,such后面常接: 1.不定冠词+形容词+单数名词 如:天气太冷了,没有几个人在大街上走. It was such a cold day that few people were walking in the stereet. 2.形容词+复数名词或不可数名词 如:它们都是如此有趣的书,以致于我很难放下. They are all such interesting books that I can hardly put them down. 天气如此炎热,很多人都下河游泳去了. It was such hot weather that many people went swimming in the river. 1.He is studying hard so that he can become a doctor. 2.She gets up early in order that she can take the earliest bus. 三.目的状语从句:目的状语从句表示主句部分的目的. 引导目的状语从句的从属连词有so that,in order that. 使用目的状语从句,因注意以下几点: 1.目的状语从句中的谓语动词常常与情态动词 can, be able to连用.如: 他很早就起床了,以便能够准时到校. He got up early so that he could get to schoo