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1、状语从句专题 一状语从句 状语从句分九类： 从句种类 主要从属连词1时间状语从句when, while, as, before, after, until, till, whenever2条件状语从句if, unless 3目的状语从句in order that, so that 4结果状语从句sothat, suchthat, so that, so5原因状语从句because, as, since6让步状语从句although, though, even though(if), while7方式状语从句as if, as though8地点状语从句where, wherever9比较状语从
2、句than, as 二状语从句详细讲解 时间状语从句 3.1时间状语从句用一般现在时表示将来。连接时间状语从句的连接词有： when(当的时候)，while（当的时候） ，as(当的时候)，once( 一旦)， till( until)（一直到，直到才） ，by the time(到时)，as soon as（一就） the moment(一就)since(自从 )before(在前)after(左后) 3.2when，while，as 均可表示“当的时候”。when 强调“特定时间”，表示主句谓语动词的动作与从句谓语动词的动作是同时发生的， 或从句的动作发生在主句的动作之前；while 表示
3、的时间是一段，而不是一点，as 多用在 口语中，强调“同一时间”或“一前一后”，有时还有“随着”的含义。Ill go on with the work whencome back tomorrow我明天回来后会继续做我的工作。When spring came, he felt like a trip.春天来了，他想去旅游。As spring warms the good earth，all flowers begin to bloom(as 有“随着”的含义) 3.3tilluntil，表示“一直到”，主从句都用肯定式；表示“直到才”，主句否定， 从句肯定。He worked until it
4、 was dark. 他一直工作到天黑。He did not get up till his mother came in. 一直到母亲进来他才起床。 3.4once“一旦”，by the time“到时”。Once you see her, you will find what I said is true. 一旦你见到她就会发现我说的是对的。by the time+现在时，主句用将来完成时。By the time he arrives, we will already have left here. 等他到达时，我们将已离开这儿了。by the time+一般过去时，主句用过去完成时。By
5、 the time he arrived, we had already left here.他到达的时候我们早已离开这儿了。 3.5as soon as，the moment 表示从句动作一发生，主句动作随即发生，通常译为“一 就”。As soon as I finish the work, Ill go to see you. 我一完成工作就会来看你。She came to the scene the moment she heard the news.她一听到消息就来到现场。 3.6since“自从”， before“在前”，after“在后”，It was not long befor
6、e 意为“不久”。 since 引导从句用非延续性动词或“过去时间点”或“过去时间段+ago”，主句用完成时态。Since he graduated, he has worked in this city. 他毕业后一直在这个城市工作。I havent seen him since last year/ three years ago. 去年以来/3 年来，我没见过他。 选出最佳答案 1) _he was listening to the music, John fell asleep. A. After B. Before C. While D. As soon as- 2) How did
7、 you try to get to school on time _you missed the school bus. A. when B. how C. why D. that 3) He was riding to school _he was hit by a car this morning. A while B. when C. as D. so 4) Lucy knew nothing about it_her sister told her. A. because B. until C. if D. since 5) The policeman asked the child
8、 _cross the street _the traffic lights turned green. A. not; when B. dont; before C. not to; until D. not to; since 6) The book was so interesting that he had read it for three hours he realized it. A. when B. after C. until D. before 7) _we had seen all the animals, we went home. A. Then B. After C
9、. Though D. While 8) She has made many friends_she came to our school. A. before B. after C. since D. until 9) How long has the weather been like this? A. Until last night B. Ever since last night C. Two days ago D. Two days later 10) My uncle went to Australia last year. We havent seen him . A. sin
10、ce almost a year B. from almost a year on C. after almost a year D. since almost a year ago 11) He was so tired that he fell asleep_he went to bed. A. as if B. even though C. ever since D. as soon as 12) I knew nothing about the accident _my friend told me yesterday. A. because B. since C. until D.
11、after 13) I didnt manage to do it _you had explained how. A. until B. since C. while D. after 【Keys】1) C 2) A 3) B 4) B 5) A 6) D 7)B 8) C 9) B 10) D 11) D 12) C 13) A 条件状语从句 【经典剖析】 1条件状语从句用一般现在时表示将来。引导条件状语从句的连词有：if 如果；unless 除非，如果不；on condition that 条件是；as long as 只要 2表示正面的条件用 if“如果”。If you dont lo
12、ok after young trees, they will die very quickly.If the museum charges for entry, a lot of people wont be able to visit it. 3表示否定的条件用 unless( =if. not)“除非，如果不”。 I shall not go to the cinema unless I finish my homework before eight.说明：ifnot 常可以用 unless 替代。If you dont study hard, you will fail in the
13、exam.You will fail in the exam unless you study hard. 4表示使某事成为现实必要的条件用 on condition that“条件是”，as long as 只要”。You may go swimming on condition that you dont swim too far away from the river bank.As long as you dont study hard, you will fail in the exam. 5祈使结构表条件。前半部分的祈使结构相当于 if 条件句，可用动词或名词开头；后半部分的简单句
14、常用一 般将来时，有时也用一般现在时。此句型与条件状语从句形成同义结构。 1) 祈使句( , ) +and/then+简单句 if 从句(否定式)+主句 Give me somewhere to stand, and I will move the earth.（如果）给我一个支点，我便能掀动 地球。=If you give me somewhere to stand, I will move the earth.One more word, and Ill turn you out. 你再多说一句，我就把你赶出去。=If you speak one more word, I will tur
15、n you out.Use your head, then youll find a way. 动动脑子你就能找到办法。=If you use your head, youll find a way. 2) 祈使句（,）+or+简单句 if 从句(否定式)+主语 Work even harder, or you will never pass the exam. 如果不加倍努力，你就永远无法通过考 试。= If you dont work harder, you will never pass the exam. Stop telling lies, or you will be punished. 如果你继续说谎，就会受到惩罚。= If you dont stop telling lies, you will be punished. 选择最佳答案填空 1) Would you like to go to the park with me, Susan? Id like to, _
