介绍:
在复合句中作状语，修饰主句中的动词、形容词或副词等。状语从句放在主句之前，常用逗号分开，放在主句之后一般不用逗号。
掌握状语从句应当从引导词入手，注意引导词的词义,引导状语从句的引导词都有意义 。
按引导词的意义分类：1)时间when , as , while , till , until , before, after , since
2)地点where
3)原因because , as , since , now that
4)条件if , unless , once .so (as)long as
5)让步though , although, whatever (…ever = no matter…) as, even though, even if
6)目的so that, in order that
7)结果so ... that, such….that
8)比较than, as .. as, so…..as
9)方式as , as if
1. I fell asleep when ( as , while ) he was doing his exercises .
他正作练习时我睡着了。（时间状语从句）
2. When he arrived in Shanghai , his mother met him at the station .
他到上海时，他妈妈到车站接他。（时间状语从句）
3．She always sings as she walks .
她总是一边走一边唱。（时间状语从句）
4．I waited until he had finished his work .
我等到他做完活。（时间状语从句）
5．It was not long before he told me about this affair .
不久，他就告诉我这件事。（时间状语从句）
6．He has worked very hard since he entered the factory .
自从他进厂，工作一直很努力。（时间状语从句）
7．After he had finished the work , he went home .
他干完活，回家了。（时间状语从句）
8．Where there is a will，there is a way .
有志者，事竟成。（地点状语从句）
9．She didn't come to school because she was ill .
她由于有病没来上学。（原因状语从句）
10．As he did not know much English , he looked up the word in the dictionary .
由于他不懂什么英语，所以查字典。（原因状语从句） 11．Now that ( Since ) I've told you twice , you must know it .
既然我告诉你两次了，你必须记住。（原因状语从句）
12．Once he says that , he will do it .
一旦他说了，他就会做。（条件状语从句）
13．Unless I receive the letter from him , I won't write to him again .
如果我不收到他的信，就不给他写回信。（条件状语从句）
14．So long as you work hard , you are sure to succeed .
只要你努力工作，就一定能成功。（条件状语从句）
15．Though we were neither very big nor very strong , we were a good team .
虽然我们个儿不大，身体不壮，但是个好队。（让步状语从句）
16．No matter who she is , she'll have to wait .
无论她是谁，也得等。（让步状语从句）
17．Poor as he was , he was honest .
虽然他很穷，但很诚实。（让步状语从句）
8．It also shows you the caller's telephone numbering in order that you can recognize who it is .
它能向你显示打电话人的号码以便能够认出是谁。（目的状语从句）
19．He was so excited that he could not say a word .
他如此激动以至于说不出话来。（结果状语从句）
20．He works as hard as he used to .
他工作与过去一样努力。（方式状语从句）
21．You must do as I told you .
你必须按我告诉你的去做。（方式状语从句）
时间状语从句
一般不用将来时。如果主句是一般将来时、祈使句或含有将来的意味，when ，before ，as soon as ，until 等引导的时间状语从句用一般现在时表示将来。
例：I will have to turn off the computer before my father __ home 。
A. comes B. come C. came D. will come
until和till 都表示“直到…”1)主句用延续性动词，主句和从句都用肯定形 式表示 “做某事直至某时”I slept until midnight. 我一直睡到半夜时醒了。Wait till I call you. 等着我叫你。 主句用结束性动词时，主句用否定式，
not…until 表达的意思是“直至…才…”She didn‘t arrive until 6 o’clock. 她直到6点才到。
Don't get off the bus until it has stopped. 公共汽车停稳后再下车。
比较until和till Until可用于句首，而till通常不用于句首
Until you told me, I had heard nothing of what happened.直到你告诉我以前，出了什么事我一点也不知道。
She won’t go away till you promise to help her. 直到你答应帮她她才会走.
条件状语从句
连接词主要有 if(如果), unless(除非),
as long as(只要) 等。
You will not pass the exam unless you study hard.
As long as you are free, you can call me at any time.
真实条件句用于陈述语气，假设的情况可能发生，其中 if 是如果的意思。
时态关系句型： 条件从句 主句 一般现在时 shall/will + 动词原形 If he comes, he will bring his violin.
典型例题 The volleyball match will be put off if it ___. A. will rain B. rains C. rained D. is rained
注意：
在真实条件句中，主句不能用be going to表示将来，该用shall, will.(错) If you leave now, you are never going to regret it.(对) If you leave now, you will never regret it.
非真实条件句
同现在事实相反的假设。
条件从句 主句 一般过去时 should( would) +动词原形
If he were here, he would help you.
If I went to the party, I would sing a song.
例题解析
1 Study hard ,____you are sure to have a good result in the exam .
A or B and C for D but
祈使句+and /or +简单句(一般将来时),其中祈使句表示条件.可以和条件句互换成同义句.
Go and ask him again ,and he will tell you 可变为If you go and ask him again ,he will tell you.
Hurry up, or we can not catch the train.可变为If you don’t hurry up, we can not catch the train. 原因状语从句
⑴because（因为，与why配套使用）
⑵since/now that（既然，因为）
Now that everybody has come, let’s begin our conference.
既然大家都来了，让我们开始会议吧。
⑶as（由于）
⑷in that（因为）
The higher income tax is harmful in that it may discourage people from trying to earn more.
更高的所得税是有害的，因为那会阻止人们努力赚更多钱。
⑸seeing that/considering that/given that（考虑到）
Considering that he is no more than 12 years old, his height of 1.80 m is quite remarkable.
考虑到他仅仅十二岁，他一米八的身高就很引人注意了。
结果状语从句so … that..., such … that...，so that(以至于......)
It’s such a good chance that we must not miss it.= It’s sogood a chance that we must not miss it.
这是如此好的一个机会，以至于我们不能错过。
注意：so+形容词/副词，因为so是副词；such+名词，因为such是形容词。
目的状语从句
so that(以便), in order that（为了） ,in case（以防）, in the hope that（希望能......）, for the purpose that（目的是......）
The boss asked the secretary to hurry up with the letters so that he could sign them.
老板让秘书快点处理信件，以便他能够签字。
The teacher raised his voice on purpose that the students in the back could hear more clearly.
老师提高声音，目的是后面的同学能够听得更清楚。
让步状语从句⑴though/although/as（虽然，尽管）
Much as I respect him, I can’t agree to his proposal.
尽管我很尊敬他,我却不同意他的建议.
注意：as 引导的让步状语从句必须用形式倒装，though引导的让步状语从句可以形式倒装也可以是正常语序，although引导的装不状语从句只能用正常语序。（参见高中英语微信号11月10日
比较状语从句
as, than
She is as bad-tempered as her mother(is).
她和她妈妈脾气一样坏。
The house is three times as big as ours.
这所房子是我们房子的三倍大。
方式状语从句
as（按照）, as if/as though（好像）,the way（用......方法）
Sometimes we teach our children the way our parents have taught us.
有时候，我们用我们父母教我们的方法来教我们的孩子。
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