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语法篇：状语从句用法解析
状语从句让很多同学感到头疼，不知如何下手。以下是小编整理的状语从句用法解析，希望对你有所帮助
一、in case引导的状语从句
根据语境的不同，in case既可表示“如果”“万一”，引导条件状语从句;也可表示“以防(万一)”，引导目的状语从句。下面两道真题均选in case：
1. Leave your key with a neighbor ______ you lock yourself out one day. (北京卷)
A. ever since B. even if C. soon after D. in case
2. My parents live in a small village. They always keep candles in the house ______ there is a power cut. (重庆卷)
A. if B. unless C. in case D. so that
【解析】两道题都选in case，均表示“以防万一”。
二、before引导的状语从句
尤其要注意“it+be+一段时间+before…”这一句型。如：
1. The field research will take Joan and Paul about five months; it will be a long time ______ we meet them again. (安徽卷)
A. after B. before C. since D. when
2. He was told that it would be at least three more months ______ he could recover and return to work. (江西卷)
A. when B. before C. since D. that
【解析】两道题均before。第1题涉及的句式为：It will be a long time before…，意思是“要过很久才会……”;第2题涉及的句式为：it was some time before…，意思是“在……之前过了一段时间”，通常可转译为“要过一段时间才会……”。
三、while引导的状语从句
尤其要注意while表示“尽管”“虽然”时的用法(此时它引导的不是时间状语从句，而是让步状语从句——此用法许多同学并不熟悉，值得特别注意!)。如：
______ I really don’t like art, I find his work impressive. (山东卷)
A. As B. Since C. If D. While
【解析】答案选D。while在此表示“尽管”“虽然”，又如：While the work was difficult, it was interesting. 尽管工作有难度，但很有趣。/While I understand what you say, I can’t agree with you. 虽然我理解你的意思，但我还是不同意。
另外，while表示对比的用法也值得注意(此时它表示“而”)。如：
The cost of living in Glasgow is among the lowest in Britain, ______ the quality of life is probably one of the highest. (天津卷)
A. since B. when C. as D. while
四、when引导的状语从句
对于when的用法，同学们最熟悉的是表示“当……的时候”。如：
—Where’s that report?
—I brought it to you ______ you were in Mr. Black’s office yesterday. (北京卷)
A. if B. when C. because D. before
【解析】答案选B。将四个选项逐一填入空格处，只有填when时，意思最通顺。句意为：当你昨天在布莱克先生办公室时我就带给你了。
但是when还有一个用法，就是表示“既然”。如：
Why do you want a new job ___D___ you’ve got such a good one already?
A. that B. where C. which D. when
还有一点也需注意，就是when表示“这时(突然)”的用法。如：
1. I had just stepped out of the bathroom and was busily drying myself with a towel ___B___ I heard the steps. (湖南卷)
A. while B. when C. since D. after
2. He was about halfway through his meal ___C___ a familiar voice came to his ears. (辽宁卷)
A. why B. where C. when D. while
AS在定语从句中的用法
as...as意为"和……一样"，表示同级的比较。使用时要注意第一个as为副词，第二个as为连词。例如：
我们要尽量少犯错误
1.we should make a few mistakes.
2.we should avoid mistakes.
3.we should make (as) a few mistakes.
4.(as) we should (avoid mistakes)
5.we should make as a few mistakes as we should.
我们要尽量多吃蔬菜
1.we should eat much vegetable food.
2.we should eat the food.
3.we should eat (as ) vegetable food.
4.(as) we should (eat the food).
5.we should eat as vegetable food as we should.
the same~~as~~
他不再是我认识的那个花花公子。
1.he is not the playboy.
2.i know the boy years ago.
3.he is not the (same) playboy.
3.(as) I know (the boy) years ago.
5.he is not the same playboy as i know.
as引导让步状语从句
结构： n./ v.原型 / adj. / adv. + as + 其他
1. adv. 提前：
Although he failed in doing his experiment again, he didn’t lose heart.
Again as he failed in doing his experiment, he didn’t lose heart.
2. adj. 提前：
Although the necklace was beautiful, we thought it was over-priced.
Beautiful as the necklace was, we thought it was over-priced.
3. n. 提前：
Although she is a child, she is knowledgeable.
Child as she is, she is knowledgeable.
单数可数名词前一般不带冠词
4. v. 提前：
Although I failed, I would never stop trying.
Fail as I did, I would never stop trying.
Try as I may, I could never explain what I hear when you don’t say a thing.
Although we may dislike him, we have to acknowledge his greatness.
Dislike him as we may, we have to acknowledge his greatness.
动宾短语同时提前
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