1、状语从句用法讲解和练习第 章 状语从句学习指导状语从句在句子中作状语，用来修饰主句或主句的谓语。一般可分为九大类,分别表示时间、地点、原因、目的、结果、条件、让步、比较和方式。尽管种类较多,但由于状语从句与汉语结构和用法相似,所以理解和掌握它并不难。状语从句的关键是要掌握引导不同状语从句的常用连接词。 现分别列举如下: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, whenever 2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 s
2、othat, suchthat, so that, so 5原因状语从句 because, as, since 6让步状语从句 although, though, even though(if), while 7方式状语从句 as if, as though 8地点状语从句 where, wherever 9比较状语从句 than, as在这一章节的学习中，要求同学们掌握各类状语从句基本概念，并能够灵活应用。第一节 时间状语从句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( unt
3、il)（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(在后)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 sprin
4、g 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)as, when, while都表示主、从句的动作或状态同时发生，但三者也有区别。as和when引导的从句既可表示一点时间，也可表示一段时间，从句中的谓语动词既可以是持续性动词，也可以为短暂性动词，经常可以互换使用；while引导的从句通常表示一段时间，从句中宜用持续性动词作谓语。当从句中的谓语动词为持续性动词时，这三者可以通用（前面例句中已有体现），再如： Mother was
5、 worried because little Alice was ill, especially as / when / while father was away in France.妈妈担心，因为小艾丽思病了，特别是当父亲远在法国的时候。 如果从句和主句要表示一个人的两个动作交替进行或同时完成时，则多用as，可译为“一边.，一边.”。例如： He looked behind from to time as he went.他一边走，一边不时地往后看。 As time goes on, its getting warmer and warmer.随着时间的推移，天气变得越来越暖了。 I t
6、hought of it just as you opened your mouth.你一张嘴我就知道你要说什么。（若表示两个短促动作几乎同时发生时，用as的场合多于when.） 当主从句之间表示转折或对比关系时，多用while, 不用as或when。如： She thought I was talking about her daughter, while in fact, I was talking about my daughter.她以为我在谈论她女儿，而事实上，我在谈论我的女儿。 如果表示从句的动作在主句的动作“之前”或“之后”发生时，多用when（=after）, 不用as或 wh
7、ile。此外，when还含有“at that moment”的意思（= and then），引起的句子不能放在句首，也不能用as, while来替换。例如： He was about to leave when the telephone rang.他正要离开，忽然电话铃响了。 We were watching TV when suddenly the lights went out.我们正在看电视，突然灯灭了。 They had just arrived home when it began to rain.他们刚到家，天就开始下雨了。3tilluntil，表示“一直到”，主从句都用肯定式；
8、表示“直到才”，主句否定，从句肯定。 He worked until it 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。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
9、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 the time he arrived, we had already left here.他到达的时候我们早已离开这儿了。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。6since“自从”， before“在
10、前”，after“在后”，It was not long before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. Wh
11、ile D. As soon as-2) How did you try to get to school on time you missed the school bus.A. when B. how C. why D. that3) He was riding to school he was hit by a car this morning.A while B. when C. as D. so4) Lucy knew nothing about it her sister told her.A. because B. until C. if D. since5) The polic
12、eman asked the child cross the street the traffic lights turned green.A. not; when B. dont; before C. not to; until D. not to; since6) The book was so interesting that he had read it for three hours he realized it.A. when B. after C. until D. before7) we had seen all the animals, we went home.A. The
13、n B. After C. Though D. While8) She has made many friends she came to our school.A. before B. after C. since D. until9) How long has the weather been like this?A. Until last night B. Ever since last nightC. Two days ago D. Two days later10) My uncle went to Australia last year. We havent seen him .A
14、. since almost a year B. from almost a year onC. after almost a year D. since almost a year ago11) He was so tired that he fell asleep he went to bed.A. as if B. even though C. ever since D. as soon as12) I knew nothing about the accident my friend told me yesterday.A. because B. since C. until D. a
15、fter13) 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第二节 条件状语从句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 look after yo
16、ung 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 exam. You wil
17、l 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；后半部分的简单句常用一般将来时，有时也用一般
18、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 turn you out. Use
19、 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
20、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, you dont want to go alone.A. until B. before C. if D. after2) Tomorrow well go to the city park it is sunny.A. as soon as B. when C. if D. as3) All of us will be happy
21、you can come with us.A. while B. if C. but D. or4) Nobody can learn English well you work hard on it.A. if B. unless C. when D. but5) The sports meet will continue it rains this afternoon.A. if B. since C. as soon as D. unless【Keys】1) C 2) C 3) B 4) B 5) D第三节 原因状语从句和地点状语从句1 原因状语从句 引导原因状语从句的连词有： beca
22、use, for, since, as, now that 1) because意为“因为”，表示直接的原因或理由，着重点在从句，用于回答why，语气最强。He is absent today because he is ill. 他今天缺席，因为他病了。I didnt go out because I was busy with homework. 我没有出去，因为我忙于家庭作业。有时，可用because of后接名词或代词表示原因，此时because of=for(介词)。We wont be able to come because of the weather. 由于天气的原因，我们来
23、不了。She was looking all the better for her stay in hospital. 她因为待在医院，显得好多了。2) for意为“因为”，引导的从句并不说明主句行为发生的直接原因，只提供补充说明，且不可位于主句前。for前往往用逗号或分号与主句分开，引起的从句对主句加以解释。I didnt go to see him, for a heavy snow was falling. 我没有去看他，因为在下大雪。The days were short, for it was now December. 白天短了，因为现在已经是十二月了。We must begin
24、planning now, for the future may bring unexpected changes.我们必须现在就开始筹划，因为将来可能会发生意想不到的变化。有时，for引起的从句并不表示原因，而是表示一种推断或解释，而because则不能。Someone in the house must be ill, for a doctor has just come out.房子里一定有人病了，因为有个医生刚刚出来。3) since意为“既然”、“由于”，一般表示对方已知的、无需加以说明的既成事实的理由(如果从句表示的原因不是确定的事实，就不能用since，通常用because)。S
25、ince you are going, I will go too. 既然你要走，我也走了。Since you are ill, Ill go alone. 由于你病了，我就一个人走了。4) as意为“由于”，表示十分明显的原因，一般说明因果关系，着重点在主句，语气较弱。As it is snowing, we shall not go to the park. 由于正在下雪，我们就不去公园了。He had to apologize, as he knew he had made a mistake. 他必须道歉，因为他知道他错了。由as表示的原因语势最弱，常用于口语。5) now that意
26、为“既然”，有时可将that省去，含义与since接近。区别在于：since表示原先已存在的情况，而now that表示现在才发生的情况。Now that it has stopped raining, lets start at once. 既然现在雨停了，咱们马上开始吧！Now that you have come, you may as well stay. 既然来了，你最好还是待在这儿。2地点状语从句 引导地点状语从句的连词有： where, wherever, anywhere, everywhere Put it where you can see it. 把它放在你看得见的地方。
27、 Ill find him, wherever he is. 不管他在哪里我都要找到他。 You should put the book where it was.你应该把书放在原来的地方。 Wherever you go, you should do your work well. 不论你到哪里都要把工作做好。选择最佳答案1) I hope to go to France some day there are many famous museums there.A. though B. unless C. because D. where2) Would you like to go to
28、the concert with me? Id love to, I cant. I have a lot of homework to do.A. and; Because B. but; Because C. so; And D. and; so3) Jim has been in the factory for two years_ he left school.A. when B. since C. as soon as D. whether4) Jack was very tired he played tennis all afternoon.A. if B. as soon as
29、 C. because D. before5) Youd better come back earlier it is getting colder.A. as B. and C. but D. or6) Jane wore a raincoat it was raining.A. so B. but C. however D. because7) The Italian boy was regarded as a hero he gave his life for his country.A. according to B. because of C. on account of D. be
30、cause【Keys】1) C 2) B 3) B 4) C 5) A 6) D 7) D第四节 让步状语从句1引导让步状语从句的连词有： although, while, even though, even if, whether. (or not), 用no matter十wh-/how 引导 2althoughthough“虽然”。 Although I didnt know anybody at the party, I had a very good time. 虽然晚会上的客人我一个也不认识，但我玩得很愉快。 注意“althoughbut”是个典型的错误，因为but是并列连词，不能
31、与从属连词although连用。但是，although可与yet，still连用，因为yet，still是副词，它可使前后关系更明确。3while意为“然而”。1) while用于对照，说明两种情况相反，意为“然而，但是”。 Tom is very outgoing, while Jane is shy and quiet.汤姆性格外向，而简却腼腆安静。 While I was reading, he was playing. 我在读书，而他在玩。2) while意为“虽然，尽管”，同although，此时从句和主句的主语往往为同一人或物。 While she liked cats。she never let them come into her room虽然她喜欢猫，但她从不让猫进她的房间。4even if “即使”（if后陈述的是假设）；even though“尽管”（though后陈述的是事实）。 Im going to apply for
