状语从句
状语从句是在句中起状语修饰作用的句子，可位于复合句的句首或句末，用陈述语序，主要用来修饰主句谓语或主句，根据状语从句在句中的不同作用，分为时间、地点、原因、目的、结果、条件、方式、让步和比较状语从句（9种）。
两种形式：
状语从句+逗号+主句
主句+状语从句
■状语从句从属连词
1.时间状语从句：when, while, as, whenever,before, after, since, until, till, as soon as, the moment, the minute, the cond, the instant, immediately, directly, instantly, once等；
2.条件状态从句：if, unless, as/so long as, in ca等；
3.目的状语从句：in order that, so that, in ca, for fear等；
4.结果状语从句：so…that, such…that等；
一、时间状语从句
■when, while as
1.It is necessary to make rules people live together.
2.Tom was about to clo the windows his attention was caught by a bird.
3.It just isn’t fair. I was working as a waiter last month, my friends were lying on the beach.
4. time goes on, it’s getting warmer and warmer.
5.He was about to leave the telephone rang.
答案：when/while, when, While/When, as, when
■before, since
1.He was told that it would be at least three more months he could recover and returen to work.
2.He hung up I told him the truth.（还没来得及做……就……）
3.It will not be long he comes back.（不久就……）
4.It is almost five years we saw each other last time.
5.I’ve been feeling down I lost my job.
答案：before, before,before,since, since,
注意：it’s+时间段+since从句（从句中用短暂性动词用直译，用延续性动词用“自从不做……已经多久”）
■as soon as
As soon as Huckle saw the food, he began to wolf them down.
1.the moment/ minute/ cond/ instant
The moment he reached the country, he started his arch.
2.immediately/ instantly / directly
I’ll give you an answer immediately I’ve finished reading your life.
Directly you feel any pains, you must go to e the doctor.
3.hardly/ scarcely…when/ no sooner…than…（注意倒装）
No sooner had I reached the railway station than the train left.
Hardly had I got to the bus stop when the bus started.
■once, until, not…until
1. environmental damage is done, it takes many years for the ecosystem to recover.
2.It is difficult for us to learn a lesson in life we’ve actually had that lesson.
3.He go to bed he finished his homework.
答案：Once, until, not until
■time类
1. I e her, I will tell her that “I love you”.
2. I met the girl, I felt in love with her.
3.You are welcome to come back you want to.
4.I went to the topics Last year.
5. they got here,we had finished the work.
答案：Next time, The first time,any time, for the first time, by the time
二、条件状语从句
■if, unless, as long as
1. he practices singing, he will become a singer in the future.
2.Owen wouldn’t eat anything he cooked it himlf.
3.—Have you got any idea for the summer vacation?
--I don’t mind where we go there’s sun, a and beach.
答案：if, unless, as long as
三、地点状语从句
■where, wherever
where引导定语从句时，where是关系副词，在从句中作地点状语，其前面有表示地点的先行词。
eg: The bookstore where I bought this book is not far from here.
where引导状语从句时，where是从属连词，where引导的从句修饰主句的谓语动词，where前面没有表示地点的先行词。
eg: Wuhan lies where the Changjiang River and the Han Jiang River meet.
1.—Mom, what did the doctor say?
--He advid me to live the air is fresher.
2.Communicate with people you go –English is spoken in more than 100 countries.
答案：where, wherever
四、原因状语从句
■becau, since, as, for（其中for非从属关系，是并列连词）
Becau语势最强，表示真正的原因，用来说明人所不知的原因，回答why提出的问题；
当原因是显而易见的或已为人们所知，就用as或since，since解释为既然；
for所提供的理由为一个补充说明，或对情况的推断、解释，而且前面常有逗号隔开；
1.Mark Twain is popular he makes great contribution to American literature.
2. Huckle couldn’t recite the book, he was punished riously.（既然）
3. it was getting late, he decided to go home.（强调客观事实）
4.It must have rained last night, the ground is still wet.
答案：becau, Since, As, for
五、让步状语从句
■as用在让步状语从句中必须用倒装（会把表语或者状语提前作倒装）
Tired as I was, I tried to help them.（=although I was tired）
Much as I respect him,I can‘t agree to his proposal.（=although I respect him much）
■-ever 和no matter wh-
1. hard he tried, she could not change her mind. He won’t listen you may say.
2. did this job must be rewarded.
