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1、初中英语语法专题复习之状语从句讲解状语从句是英语语法中的一个重要概念，它通常由连词引导，可以充当句子的状语。根据的资料，状语从句可以分为九大类，分别是:时间状语从句:常用引导词有when、while、before、after、since、till、until等，特殊引导词有the minute、the moment、the second、every time、the day、the instant等。地点状语从句:常用引导词有where、in which、on which等。原因状语从句:常用引导词有because、since、as等。目的状语从句:常用引导词有to、in order to等。
2、结果状语从句:常用引导词有so、therefore、thus、thusly等。条件状语从句:常用引导词有if、unless、provided that等。让步状语从句:常用引导词有although、though、even though等。比较状语从句:常用引导词有asas、than等。方式状语从句:常用引导词有how、whenever等。(一)时间状语从句表示时间的状语从句可由when, as, while, whenever, after, before, till (until), since, once, as soon as (或the moment ), by the time, n
3、o sooner than, hardly (scarcely) when, every time等引导。e.g. When I came into the office, the teachers were having a meeting.He started as soon as he received the news.Once you see him, you will never forget him.No sooner had I gone to bed than I went to sleep.(二)原因状语从句原因状语从句是表示原因或理由的，引导这类从句的最常用的连词是bec
4、ause, since, as , now that(既然)等，for 表示因果关系时(它引导的不是从句)为并列连词，语气不如because强。e.g. He is disappointed because he didnt get the position.As it is raining, I will not go out.Now that you mention it, I do remember.(三)地点状语从句引导地点状语从句的连词是where 和wherever等。e.g. Sit wherever you like.Make a mark where you have a q
5、uestion.(四)目的状语从句引导目的状语从句最常用的词(组)是so, so that(从句谓语常有情态动词), in order that, in case(以防，以免)等。e.g. Speak clearly, so that they may understand you.She has bought the book in order that she could follow the TV lessons.He left early in case he should miss the train.(五)结果状语从句结果状语从句是表示事态结果的从句，通常主句是原因，从句是结果。由
6、so that (从句谓语一般没有情态动词), so that, such that等引导。e.g. She was ill, so that she didnt attend the meeting.He was so excited that he could not say a word.She is such a good teacher that everyone admires her.(六)条件状语从句条件状语从句分真实性(有可能实现的事情)与非真实性(条件与事实相反或者在说话者看来不大可能实现的事情)条件句。引导条件状语从句的词(组)主要有if, unless, so (as)
7、 long as, on condition that, so (as) far as, if only ( = if )。注意：条件从句中的if 不能用whether替换。e.g. If he is not in the office, he must be out for lunch.You may borrow the book so long as you keep it clean.So far as I know(据我所知), he will be away for three months.You can go swimming on condition that ( = if
8、) you dont go too far away from the river bank.If he had come a few minutes earlier, he could have seen her.(七)让步状语从句让步状语从句可由although, though, as, even if (though), however, whatever, whether or, no matter who (when, what, ) 等引导。注意：as引导的让步状语从句一般是倒装的。e.g. Though he is a child, he knows a lot.Child as
9、 he is, he knows a lot.Whatever ( = No matter what ) you say, Ill never change my mind.(八)方式状语从句方式状语从句常由as, as if (though), the way, rather than等引导。e.g. You must do the exercise as I show you.He acted as if nothing had happened.(九)比较状语从句比较状语从句常用than, so (as) as, the more the more等引导。e.g. I have made
10、 a lot more mistakes than you have.He smokes cigarettes as expensive as he can afford.The busier he is, the happier he feels.(十)使用状语从句时要注意的几个问题1、在时间和条件(有时也在方式、让步等)从句中，主句是一般将来时，从句通常用一般现在时表示将来。e.g. Well go outing if it doesnt rain tomorrow.Ill write to you as soon as I get to Shanghai.2、有些时间、地点、条件、方式或
11、让步从句，如果从句的主语与主句主语一致(或虽不一致，是it)，从句的谓语又包含动词be ，就可省略从句中的“主语 + be”部分。e.g. When (he was) still a boy of ten, he had to work day and night.If (you are) asked you may come in.If (it is) necessary Ill explain to you again.3、注意区分不同从句：引导的是什么从句，不仅要根据连词，还要根据句子结构和句意来判别。以where为例，能引导多种从句。e.g. You are to find it wh
12、ere you left it.(地点状语从句)Tell me the address where he lives.(定语从句，句中有先行词)I dont know where he came from.(宾语从句)Where he has gone is not known yet.(主语从句)This place is where they once hid.(表语从句)如何区分状语从句?状语从句是英语语法中的一个重要概念，它通常由连词引导，可以充当句子的状语。在练习状语从句时，需要注意时态、人称、陈述语气和标点等方面。以下是一些区分状语从句的方法:判断状语从句的类型:状语从句可以分为时
13、间状语从句、地点状语从句、原因状语从句、结果状语从句、条件状语从句等。根据句子的语境和逻辑关系，判断哪个是从句，哪个是主句。注意连词的使用:状语从句用连词引导，常用的连词有as、when、since、unless等。根据连词的使用，判断哪个是从句，哪个是主句。注意时态的使用:状语从句的时态应该与主句的时态保持一致。如果主句是现在时，那么从句也应该是现在时;如果主句是过去时，那么从句也应该是过去时。注意人称的使用:状语从句的人称应该与主句的人称保持一致。如果主句是第三人称，那么从句也应该是第三人称。注意陈述语气的使用:状语从句通常使用陈述语气，表示事实或情况。如果从句使用了疑问语气或感叹语气，那
14、么就不是状语从句了。状语从句是英语语法中的一个重要概念，它通常由连词引导，可以充当句子的状语。在练习状语从句时，需要注意时态、人称、陈述语气和标点等方面。以下是一些状语从句练习题及其解析:After he had finished his homework, he went to bed. A. as B. when C. since D. unless 答案:A。解析:状语从句用连词as引导时间状语从句。I was so tired that I fell asleep right away. A. as B. when C. since D. unless 答案:B。解析:状语从句用连词w
15、hen引导原因状语从句。The day after tomorrow is Sunday. A. as B. when C. since D. unless 答案:C。解析:状语从句用连词since引导时间状语从句。He was so excited that he couldnt sit still. A. as B. when C. since D. unless 答案:A。解析:状语从句用连词as引导方式状语从句。I was in the middle of doing my homework when I heard a knock at the door. A. as B. when C. since D. unless
