原因状语从句解析_.doc
原因状语从句解析_原因状语从句解析在句中作原因状语的从句称为原因状语从句。原因状语从句可置于句首,也可置于句尾。引导词有 because,as,since,now that,in that 等。1.because的用法表因果关系的语气最强,用来回答why引导的问 句,所引出的原因往往是听话人所不知道或最感兴趣 的,because引导的原因状语从句往往比主句显得更重要。I m leaving because I am fed up with the boss.我离开是因为我讨厌老板。Why were you absent from the meeting?开会时你为什么缺席?Because I was ill.因为我生病了。2.since的用法表示人们已知的事实,不需强调的原因.故翻译成 既然 ,通常放在句首。since引导的从句是次要的,重点强调主句的内容,相当于now that:Since everyone is here,let s get started.既然大家都来了,咱们开始吧。Since you are free tonight,why not drop in, chess with me?既然你今晚K事,为什么不来和我下棋呢3.as的用法as与since用法差不多,所引出的理由在说话人看来巳经很明显,或已为听话人所熟悉而不需要 since,as语气稍弱。As it was a public holiday,all the shops wa由于这是一个公共假日,所有的商店都关She didn t hear us come in as she was aslee她睡着了没听见我们进来。because,as,since/now that 的区别:It was because I wanted to see my uncle that I went to town yesterday.因为想去看叔叔我昨天才进城的。【知识拓展】for和上述三个从属连词不同,它是一个并列连词,即连接并列句。它有时可用来作附加说明,为前面的事实提供一种推断的理由。一般把for连接的并列分句放在后面。We should be more careful,for it is already dark.天已晚了,我们应更小心些。Let s stay home,for it,s raining hard outside.我们待在家里吧,外面正下着大雨。4.now that的用法now that主要用于口语中,表示微弱的原因,主从句的因果关系不明显,常翻译为 既然 。that有时可以省略。Now ( that) you understand,I don t need to explain again.既然你已明白,我没有必要再解释一遍。5.in that的用法这个短语常用于书面语中,表示 由于某种原因 。This experiment is worth trusting in that it is based on scientific facts.这个实验值得信赖,因为它是建立在科 学事实基础之上的。I like the city, but I prefer the country in that there s fresher air.我喜欢城市,但我更喜欢乡村,因为那里有更 清新的空气。6.when也可以表示原因,意为 既然;考虑到 ,相当于 considering thatIt was foolish of you to take a taxi when walk there in five minutes.既然你步行5分钟能到那里,却乘出租车,真够愚蠢的。.例 1 _ he didn t know much English ,he got out his dictionary and looked up the word cough A.As B. Unless C.When D.Though解析句意:他对英语懂得不多,所以拿出词典查找 cough 这个单词。由句意可知应用as。as表示原因时,其原因只是对结果的附带说明,一般放在句首。答案A例 2 _that my head had cleared,my brain was also beginning to work much better.A. For B.Now C. Since D.Despite解析句意:由于我的头脑清晰,思维也变得灵活起来。根据句意,应用原因状语从句。由于有 that 故选now,构成now that 既然 之意,故选B: 答案B第 4 页 共 4 页