1、1状语从句一定义：在句中作状语的从句是状语从句，修饰主句中的 动词、形容词或副词 等。状语从句由从属连词引导，从属连词在句中不充当句子成分，只起连接作用，状语从句放在句首时，要用逗号，放在句尾时不用。二 时间状语从句 引导时间状语从句的连词有：as, when(whenever), before, after, as soon as, until(till), since, every time, once.(1)“as” as, when, while 都有“当的时候” ，可以互用While/ When /As she was a child，She Lived in Paris.(2) a
2、s 有“一边 一边”的意思He sang as he walked.(3) “when”（短暂性动词为主）When the clock struck twelve, all the lights went out.I was sleeping when she came in. 动补“while” 主、从句动作或状态同时发生。用 while 引导的从句用延续性动词，常表示较长的时间或一个过程。While we were having supper, all the lights went out.While I was writing letters last night, he was wa
3、tching TV. (4)when, while 并列连词。when 和 while 都可用作并列连词，连接并列分句。 When 表示“就在的时候”, while 意反而，可是，表示转折，对比。One evening Beethoven was walking in a street, he suddenly stopped outside a little house. 主句是一般将来时，时间状语从句用一般现在时表将来，主句是过去将来时，从句用一般过去时表示过去将来时，主句是一般过去时，从句用一般过去时。1. Ill call you when I get there. 2. They l
4、eft as soon as they got the new. Whenever 无论什么时候，随时1. Whenever someone throws in some rubbish, the truck produces a piece of music.2. Whenever were in trouble, they will help us. 3. Come and see me whenever you want to. till 和 until(表示“直到 ”)句首多用 until1、在肯定句中表示“直到为止” ，主句谓语动词要用 动词。I was waiting until/
5、till he arrived.2、在否定句中表示“直到才” ，主句谓语动词常用 动词，这时 until 和 till 常被before 替换。 I didnt leave till/until she came back. （before） Since: (1).主句用完成时，从句用一般过去时，since 引导的从句间或可用现在完成时。1. We have known each other since we were children.2. We have been friends (ever since) since we met at school.(2) .It is (一段时间)+s
6、ince+一般过去时态句子。It is two years since my sister married.(一段时间) have/has passed since +一般过去时态句子Two sisters have/has passed since my sister married.(3).Since+时间点21. I have been at home since three oclock. / Maria has been in China since two years ago.*every time, each time, next timeEvery time you get b
7、ack at night, you drop your boots on the floor.(every time 分写不可合写)比较 everyday (adj)日常的，普通的 every day 是名词短语，每天，* once 一旦就 Once you begin, you must go on. 你一旦开了头，就应该继续下去。三 地点状语从句地点状语从句用 where, wherever 引导We should go where the people need us. 我们应该去人民需要我们的地方。（改成定语从句 ）Where there is a will, there is a w
8、ay. 有志者，事竟成。Wherever they went, they received a worm welcome.无论他们走到哪儿都受到热烈欢迎。四 原因状语从句原因状语从句用 because(因为)，since( 既然), as(由于) 引导 a) 字母由多到少，语气由强到弱。b) 由 why 提问必须用 because 回答。Since, as 不回答 why 的提问，而且从句一般放在句首， because 一般放在主句之后。c) before of +名词 e.g. Because of the rain, we didnt go to the park.d) because 和
9、 so 不可连用，只能选其一。 （另有 although, but）Why didnt he come to school? Because he was ill.Since I must die, I must. 既然我一定要死，我一定这样做。Since a lot of people make mistakes in life, Mr. Smith wanted to give John a Chance.e) for 并列连词，不能放在句首，主要放在两个并列句之间 。For 所提供的理由为一个补充说明，而且前面常有逗号隔开。The days we short, for it is Dec
10、ember now.*改错 Because he is ill is the reason why he cant come.五. 目的状语从句目的状语从句用 so(常用于口语 ), that, so that, in order that 引导 (比较 in order to, so as to 等)目的状语从句的谓语常含 may, might, can, could, should, would 等情态动词。1。Well sit never to the front so we can hear better. 2.Ill speak slowly so that you can take
11、 notes.3They hurried to the station in order that they could catch the train.六 条件状语从句条件状语从句由 if, unless（除非）, (so) as long as(只需，只要)引导在条件状语从句中要用一般时表示将来时（与时间状语从句相同）We will miss the train if you dont hurry. / He said we would miss the train if we didnt hurry.You will fail the exam unless you study hard
12、. (if you dont study hard)He wont come unless (he is) invited. (if he isnt invited)As long as you are not afraid of difficulties, you are sure to succeed.七. 结果状语从句结果状语从句由 suchthat, so.that, so that, that 引导1. such that 的常用句型 so that3such +a/an +形容词 +可数名词单数+thatSuch+形容词+可数名词复数（不可数名词）+that注意 so many (
13、much, few, little) +名词，such a lot of ( 或 lots of)+名词是惯用法，不可乱用。She is such a beautiful girl that we all like her. /It was such delicious food that they ate it up.2. so+形容词或副词 +thatso+形容词+a/an+可数名词单数 +thatHe is so rich that he can buy lot of things for himself.It was so hot a day that we all went swim
14、ming. /It was such a good day that we all went swimming.3.so that, that 都可以引导结果状语从句He didnt study hard, (so) that he failed the exam.4.tooto, enoughto 可引导结果状语从句与 sothat 替换 .sothat 结构可以用 tooto 替换必须具备两个条件，一, 主句和从句的主语必须一致，二, 从句的谓语部分必须含 can(could) not.She is young that she cant go to school. / She is to
15、o young to go to school.She isnt old enough to go to school.八. 让步状语从句although, though even though = even if, whetherorhowever = no matter how whatever = whoever = whenever = wherever = although 和 though 都表示“虽然”只是 although 更正式，多用于句首，而 though 多用于句中，二者都可与 yet, still 连用，但不与 but 连用Although/Though they ar
16、e poor, they often help others. /They are poor, but they often helpAlthough he has failed many times, he doesnt give up trying.Whatever/No matter what you say, I wont believe you.However hard he tried, he failed again. 无论他怎么努力，他还是失败了。No matter what the weather is like, you can always find surfers ou
17、t riding the waves.*九. 方式状语从句方式状语从句由 as(如同，按照) ，as if (though)引导*as 和 like 都有 “像”的意思，as 是连词，后面连接句子，like 是介词后面可加名词、代词或名词性短语。I did the work as others did. 相当于 I did like others.You must do as I do.as if(though)两者意义相同，从句谓语动词常用虚拟语气，但实现可能性较大，则用连接词。It seems as if/though its going to rain.She treats me as
18、if I were her brother.When you are in home, do the Romans do.例 You must do _ I told you. A. after B. before C. where D. as 十、 比较状语从句比较状语从句由 asas, not as(so)as, than, the+比较级，the+比较级引导He swims as well as you. (do) He got here earlier than you. (did)4He doesnt swim as well as you (do). The busier he is, the happier he feels.
