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1、师说微课堂 专题: 状语从句 第十一讲 ： since as because for 夯实基础 判断 Because he was ill, so he didnt go to school. Because与so在一句话中不能同时出现。故so 是多余的 。 because, as, for, sincebecause, as, for, since这几个词都是表示这几个词都是表示“ “原因原因” ”的连词，的连词， 语气由强至弱依次为：语气由强至弱依次为：becausesinceasfor ;becausesinceasfor ; because, since, asbecause, sin
2、ce, as均为从属连词，引导原因状语从句；均为从属连词，引导原因状语从句； for for 是并列连词，引导并列句。是并列连词，引导并列句。 because, as, for, since because, as, for, since 用法用法 1、 because表示事情发生的直接原因或理由，它的语气很强。 I missed the train because I got up late. I stayed at home because it rained. 1)回答why的提问,必须用because。 Why didnt he come yesterday? _ he was ill
3、. ABecause BAs CSince DFor because 2) 在强调原因状语从句时，只能用because。 It was because it rained hard that they put off the football match. 3)because 不能与so连用。 4)because+ 从句；because of+ 名词短语 I came back because it was raining heavily. I came back _ _ the heavy rain.because of since since侧重主句，从句表示显然的或已为人所知的理由，常译
4、为“因为” “既然”，语气比because稍弱，通常置于句首。例如： (1)Since he asks you, youll tell him why. 他既然问你，那就告诉他为什么吧。 (2)Since everyone is here, lets start. 既然大家都到齐了，我们就出发吧。 as常用于表示十分明显的原因，说明因果关系，重点放在主句上，语气 较弱，常译成“由于”。如： as As its getting darker, we must go home now. I went to bed early, as I was exhausted. As it is rainin
5、g, youd better take a taxi. for是并列连词(其他为从属连词)，它有时可表示因果关系(只能放在主句 之后)，是对前面分句的内容加以解释。如： for It must have rained last night, for the ground is wet. Day breaks, for the bird sings. 1) The ship changed its course because there was a storm. The ship changed its course _ _ the storm. 2) Because he was ill,
6、he didnt go to school. He was ill, _ he didnt go to school. 3) He couldnt walk because his leg was broken. He couldnt walk _ _ his broken leg. 改写句子 Because of so because of 注意：for所引导的分句只能放在句子后部或单独成为一个句子，引导 的从句一般不放在句子的开头。 要点突破 For Mike was ill, she didnt come to school. 改错 because 知识应用 考题1 _ youve go
7、t a chance, you might as well make full use of it. (1999) A. Since B. After C. Although D. As soon as 答案解析：主句与从句之间存在因果关系， 且“youve got a chance” 表示一个显而易见的原因， 因此应选用表原因的since。 知识用 考题2 He found it increasingly difficult to read, _ his eyesight was beginning to fail. (2006北京) A. and B. for C. but D. or 答案解析： “his eyesight was beginning to fail”是“he found it increasingly difficult to read”的原因， 因此本题应选用可以表示原因 的连词for引导原因状语从句。 because since as for的用法区别 意义位置 because因为强调未知原因多后置 since既然 表示已知显然的理由 常前置 as由于常前置 for因为常用于推断、补充解释后置 亮点概述 一样的知识 不同的视角