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1、状语从句状语从句1、本讲内容：学习状语从句。、本讲内容：学习状语从句。2、学习要求：、学习要求：（1）掌握状语从句的种类。）掌握状语从句的种类。（2）学会引导状语从句的从属连词。）学会引导状语从句的从属连词。3、学习指导：、学习指导：（1）本讲重点：状语从句的种类。）本讲重点：状语从句的种类。（2）本讲难点：从属连词之间的区别。）本讲难点：从属连词之间的区别。4、典型例题解析：、典型例题解析： 状语从句在主从复合句中修饰主句状语从句在主从复合句中修饰主句中的动词，形容词或副词，按意义可分中的动词，形容词或副词，按意义可分为为时间、地点、原因、目的、结果、条时间、地点、原因、目的、结果、条件、方
2、式、比较、让步等状语从句件、方式、比较、让步等状语从句。从。从句的位置放在句首，也可放在句末。放句的位置放在句首，也可放在句末。放在句首时，从句后面常用一个逗号，放在句首时，从句后面常用一个逗号，放在句末时，从句前一般不用逗号。在句末时，从句前一般不用逗号。1、时间状语从句：、时间状语从句： 引导时间状语从句的从属连词引导时间状语从句的从属连词有：有：when, while, as, whenever, before, after, since, till, until, as soon as, once等引导。如：等引导。如： When he was still a young man, h
3、e was forced to leave his homeland for political reasons. It has been 15 years since he left. Ill tell him the news as soon as I see him. Once you have got used to it, you will like it. I waited till he had finished his work.注意：注意：（1）when, as, while when即可引导即可引导持续性动作持续性动作，又可，又可引导引导短暂性动作短暂性动作。它可以表示主句
4、的。它可以表示主句的动作和从句的动作动作和从句的动作同时发生同时发生，或，或从句从句的动作发生在主句动作之前的动作发生在主句动作之前。如：。如： When I was a boy, I used to go to the seashore on Sundays.（同时）同时） When the lesson was over, we began our writing.（从句动作在前）从句动作在前） as引导引导持续性动作持续性动作，侧重主句和从，侧重主句和从句的动作句的动作同时发生同时发生。 He hurried home, looking behind as he went. I saw
5、your sister as she was getting on the bus yesterday. He sang as he walked.While：指的是指的是“在某一时间里在某一时间里”，“在在期间期间”，从句里的动作必须是，从句里的动作必须是持续性的持续性的，它也强调主句和从句动作，它也强调主句和从句动作的的同时发生同时发生，往往侧重主句和从句，往往侧重主句和从句动动作的对比作的对比。如：如： While he was in London, he studied music. While we were watching TV, he was writing a composi
6、tion. while也可做并列连词，表示对照的也可做并列连词，表示对照的意思。如：意思。如：He is tall while his brother is short. 当当when, as, while表示表示“在在一段一段时间里时间里”，主从句的动作同时发生时，主从句的动作同时发生时，可以换用可以换用。如：。如： While (When或或As) we were discussing, Mr. Smith came in. （2）如果）如果when和和before引导的从引导的从句位于主句之后，有时不能译成句位于主句之后，有时不能译成“当当时候时候” 和和“在在之前之前”，而要译，而要译
7、成成“就就”、“才才”、“这时这时”等。如：等。如： The struggle lasted four years before the North won in the end.斗争持续斗争持续4年，北方最后才获胜。年，北方最后才获胜。 He almost knocked me down before he saw me.他快把我撞倒了才看见我。他快把我撞倒了才看见我。I was walking in the street when I saw him. 我正在大街上走，这时我看见了我正在大街上走，这时我看见了他。他。 (3) by the time, each time, every ti
8、me, immediately, the moment, 都可都可以作为连词，引导时间状语。如：以作为连词，引导时间状语。如： By the time he was fourteen, he had taught himself advanced mathematics. Each time he came, he would call on me. You must show him in immediately he comes. I recognized him the moment I saw him.(4) till和和until 如果主句谓语动词是持续动词，如果主句谓语动词是持续动
9、词，通常用肯定式的主句，表示通常用肯定式的主句，表示“直到直到为止为止”。如：。如： I worked till (until) he came back. 如果主句谓语动词是瞬间动词，如果主句谓语动词是瞬间动词， 则用否定式的主句表示则用否定式的主句表示“直到直到 才才”。如：。如： I didnt go to bed until (till) he came back.放放在句首在句首表示强调时一般用表示强调时一般用 until。如：如： Until he returns, nothing can be done.（5）时间状语从句中谓语动词）时间状语从句中谓语动词 不能用任何一种将来时，
10、不能用任何一种将来时， 只能用现在时和过去时表只能用现在时和过去时表 示将来时。示将来时。2、地点状语从句：、地点状语从句：通常由连词通常由连词where和和wherever引导。如：引导。如： Go back where you came from. Wherever you go, you must write to your parents. Where there is a will, there is a way. 3、原因状语从句：、原因状语从句： 通常由连词：通常由连词：because, as, since, 引导。引导。 区别是区别是:because：表示表示“因为因为”，直接
11、而明确的，直接而明确的原原 因和理由，语气最强，因和理由，语气最强，why提提 问的句子，一般都用问的句子，一般都用because 回答。回答。He didnt come because he was ill.since：表示表示“既然既然”，语气比，语气比because弱。弱。Since you are here, you must do it.as：表示表示“因为因为”语气比语气比because轻，轻，引引 导从句可放主句前也可放主句后。导从句可放主句前也可放主句后。You neednt go with me, as you are busy.As I was afraid, I hid
12、myself.注意：注意： 在强调句中强调原因状语从句，在强调句中强调原因状语从句， 只能用只能用because引导，不可用引导，不可用as或或 since，如：如： It was because he was ill that he didnt go with us. because可以引导表语从句可以引导表语从句,而而 as, since不可以，这时主语一不可以，这时主语一 般都是般都是it, this, that Its because he is too lazy. for也也表示表示“因为因为”，但是并，但是并列列 连词，它连接的不是状语从连词，它连接的不是状语从 句，语气比较强。句
13、，语气比较强。 It must be morning, for the birds are singing.4、目的状语从句：、目的状语从句： 通常由通常由that, so that, in order that, sothat, in case（以防、免得）等引导：以防、免得）等引导： He got up early in order that he could catch the early bus. She married him so that she might tend and comfort him. I explained again and again in case he
14、should misunderstand me.lest (以免，免得以免，免得), for fear that I hid the book lest (=for fear that) he should see it.目的状语从句中谓语动词常含有目的状语从句中谓语动词常含有may (might), can (could) should, will等情等情 态动词。态动词。5、结果状语从句：、结果状语从句：由由that, so that, sothat, suchthat引导：引导： It was very cold, so that the river froze. The book is
15、 so written that it gives a quite wrong idea of the facts. There were so many people (=such a lot of people) in the room that we could not get in. He made such an excellent speech that every one admired 佩服佩服 him.6、条件状语从句、条件状语从句: 由由 if, unless, as long as (=so long as) (只要只要), in case (that) (如果，万如果，
16、万一一)等引导：等引导： If plastics and rubber are burned, they give off poisonous gases. Unless you work hard, you will fail, You can go out, as long as (so long as ) you promise to be back before eleven. In case I forget, please remind me about that. 注意：条件状语从句中的谓语动注意：条件状语从句中的谓语动词的时态不可用将来时，只能用现在词的时态不可用将来时，只能用
17、现在时态或过去时态表示将来时。时态或过去时态表示将来时。7、方式状语从句：、方式状语从句：由由连词：连词：as, as if, as though引导：引导： The teacher told the students to do as he did. Leave it as it is. He heard a noise, as if someone was breathing. I saw the man looking about him as if he wished to impress upon his mind everything. as if和和as though意义和用法大
18、致一意义和用法大致一样，引导的从句多用虚拟语气，但也样，引导的从句多用虚拟语气，但也可用陈述语气。可用陈述语气。He treats me as if I were his own son.He walked as if he were drunk. 8、比较状语从句：、比较状语从句： 由连词由连词asas, not so(as) as, than等引导：等引导： I hope it was as good as the one you lent me. Actually the ocean floor are almost as irregular as the exposed land ar
19、ea. No one can be more fit for his office than he is. He cant run so fast as she.注意：注意：“the+比较级比较级(接从句接从句)，the+比比较较 级级(接主句接主句)，这一句型也归在比，这一句型也归在比 较状语从句内。如：较状语从句内。如： The more you study, the more you know. The harder we work, the happier we feel.9、让步状语从句：、让步状语从句： 由由though, although, as (虽虽然尽管然尽管), even
20、 if, even though, wh-ever, no matter-wh, whether引导引导.whateverwhoeverwhicheverwheneverwhereverhoweverwh - everno matter whono matter whatno matter whichno matter whenno matter whereno matter howno matter wh- Though he is old, yet he is active. Although most of the people agreed, some were not willing
21、 to accepted. Proud as the nobles are, he is afraid to see me. We wouldnt lose heart even if we should fail ten times. Whenever (=no matter when) you call on me, you are always welcome. Wherever (no matter where) you work, you can always find time to study. Take the one you like best, whichever (no
22、matter which) it is. No matter what I say or how I say it, he always thinks Im wrong. Whether he comes or not, well discuss the problem this afternoon.注意：注意： （1）让步状语从句在句中的位置）让步状语从句在句中的位置可放前也可放后，有时还可以插在可放前也可放后，有时还可以插在主句中间，前置时，强调主句内容，主句中间，前置时，强调主句内容，后置时强调从句内容。后置时强调从句内容。 （2）though与与although同义，用同义，用法基本一
23、样，前者通俗，口语化；法基本一样，前者通俗，口语化；后者较正式，多放于句首，不能与后者较正式，多放于句首，不能与but连用，但可以与连用，但可以与yet, still等连用，等连用，用来加强语气。用来加强语气。Though ( Although ) he was tired, yet (still) he went on working.（3）as引导让步状语从句时从句部分引导让步状语从句时从句部分 语序要部分倒装。如：语序要部分倒装。如： Young as he is, he can read and write in several foreign language.（表语提前）表语提前） Child as he was, he had to support the family.（表语名词提前并常省去冠词）表语名词提前并常省去冠词）
