高中英语状语从句sinceasbecausefor赵丽娜PPT课件

1、专题专题: : 状语从句状语从句 第十一讲第十一讲 ： since as because forsince as because for第1页/共15页 夯实基础夯实基础判断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。第2页/共15页第3页/共15页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

2、,必须用because。 Why didnt he come yesterday? _ he was ill. ABecause BAs CSince DForbecause第4页/共15页 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 _ _

3、the heavy rain.because of第5页/共15页since since侧重主句，从句表示显然的或已为人所知的理由，常译为“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。 第6页/共15页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：asAs its getting darker, we mu

4、st go home now. I went to bed early, as I was exhausted. As it is raining, youd better take a taxi. 第7页/共15页 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：forIt must have rained last night, for the ground is wet.Day breaks, for the bird sings. 第8页/共15页1) The ship changed its course because

5、 there was a storm. The ship changed its course _ _ the storm.2) Because he was ill, 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第9页/共15页注意：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

6、不放在句子的开头。 要点突破要点突破For Mike was ill, she didnt come to school. 改错because第10页/共15页知识应用知识应用考题1 _ youve got 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。 第11页/共15页知识用知识用考题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。 第12页/共15页 because since as fo