牛津译林版中考英语语法课件— 原因状语从句.pptVIP

原因状语从句 * 引导原因状语从句的从属连词 1、because 因为 表示造成某种情况的直接原因，回答why引导的问句，不能和so同时使用。 I often exercise at the park because I love the clean air and sunshine. 我经常在公园锻炼，因为我喜欢干净的空气和阳光。 2、since既然 语气比because弱，表示对方已知或众所周知的原因。 Since we have no idea about this problem, let’s as Mr Wang for help. 既然我们对这个问题不了解，就请王老师帮忙吧。 3、as 由于 语气比since弱，表示众所周知的原因，引导的从句可以放在主句前，也可以放在主句后。 As it is getting late, I decide to leave now. 由于天越来越晚，我决定现在离开。 * Since everyone is here ,lets start Since so ,I have nothing to say. Since you are wrong, you should say sorry. since侧重主句，意思是“既然；由于；因为”，表示已知的、显然的理由since 比as语气稍强，且比as略微正式，它们引导的从句通常放在主句之前，有时也放在主句之后。不表示直接原因。Since可用于省略句，而其他连词不行。（见例2） * as 鉴于主从并重，从句说原因，主句说结果 。 As it is late, I must go . As you were not there , I left a message. as和since的用法大体相同，表示附带说明的“双方已知的原因”或者理由不是很重要，但语气更弱，没有since正式，常译为“由于，于”。 As it is raining, you’d better take a taxi. 既然在下雨， 你最好乘出租汽车。 As you are tired, you had better rest. 既然累了， 你最好休息一下。 * 1. I’ll help you with your study ____ you don’t do well in it. A. so B. until C. since D. though 2.--Could you tell me ________ yesterday? ---Because my bike was broken on my way here. A. why you came late B. why do you come late C. why you come late D. why did you come late 3. ______ you are wrong, you should say sorry to him. A. but B. Since C. until D. or 4._____the girl is 22, she takes care of her mother and cooks meals every day. A. If B. But C. Though D. As 5. _________ she had no money to afford the expensive car, she had to give it up. A. So B. and C. Since D. Until C A B D C * because of 也可表达直接的原因，只不过其 接名词、代词或动名词。一般情况下可以 because 引导的从句互换。 1. 由于生病，他不能来。 He can’t come __________his illness. =He can’t come _______he is ill. 2. 由于大雨，他迟到了。 He was late ___________getting up late. = He was late ________ he got up late. because of