高考英語常考語法點：常考的八類狀語從句
語法是英語高考必考的考點，掌握好語法知識很關鍵。現在小編爲大家梳理高考英語語法常考的八大狀語從句，希望對大家有幫助。
一、where引導的狀語從句
where可以用於引導地點狀語從句，其意爲“在……的地方”，此用法許多同學都不是熟悉，但高考經常考查，應引起特別注意。如：
1. If you are traveling ______ the customs are really foreign to your own, please do as the Romans do. (天津卷)
A. in which B. what C. when D. where
2. —Mom, what did your doctor say?
—He advised me to live ______ the air is fresher. (四川卷)
A. in where B. in which C. the place where D. where
【解析】兩道題都選where，均表示“在……的地方”。
二、before引導的狀語從句
尤其要注意“it+be+一段時間+before…”這一句型。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】兩道題均before。第1題涉及的句式爲：It will be a long time before…，意思是“要過很久纔會……”;第2題涉及的句式爲：it was some time before…，意思是“在……之前過了一段時間”，通常可轉譯爲“要過一段時間纔會……”。
三、while引導的狀語從句
尤其要注意while表示“儘管”“雖然”時的用法(此時它引導的不是時間狀語從句，而是讓步狀語從句——此用法許多同學並不熟悉，值得特別注意!)。如：
______ I really don’t like art, I find his work impressive. (山東卷)
A. As B. Since C. If D. While
【解析】答案選D。while在此表示“儘管”“雖然”，又如：While the work was difficult, it was interesting. 儘管工作有難度，但很有趣。/While I understand what you say, I can’t agree with you. 雖然我理解你的意思，但我還是不同意。
另外，while表示對比的用法也值得注意(此時它表示“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引導的狀語從句
對於when的用法，同學們最熟悉的是表示“當……的時候”。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】答案選B。將四個選項逐一填入空格處，只有填when時，意思最通順。句意爲：當你昨天在布萊克先生辦公室時我就帶給你了。
但是when還有一個用法，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
還有一點也需注意，就是when表示“這時(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. (遼寧卷)
A. why B. where C. when D. while
五、unless引導的狀語從句
unless的意思是“如果不……”“除非”，對於涉及unless的考題，一般只要能讀懂句意，弄清語境，一般不會有問題。如：
1. Most birds find it safe to sleep in the trees, but ______ they have eggs or young chicks, they don’t use a nest. (湖南卷)
A. why B. how C. unless D. where
2. I won’t call you, ______ something unexpected happens. (全國I)
A. unless B. whether C. because D. while
【解析】兩道題都選unless，均表示“除非”。
六、until引導的狀語從句
until的意思是“直到……時”“在……之前”，對於涉及until的考題，一般只要能讀懂句意，弄清語境，一般不會有問題。如：
It is difficult for us to learn a lesson in life ___A___ we’ve actually had that lesson. (天津卷)
A. until B. after C. since D. when
另外，還要注意not…until…這一句式(直到……才)。如：江蘇高考網
“You can’t have this football back ___D___ you promise not to kick it at my cat again,” the old man said firmly. (廣東卷)
A. because B. since C. when D. until
七、once引導的狀語從句
once的意思是“一旦”，對於涉及once的考題，一般只要能讀懂句意，弄清語境，一般不會有問題。如：
1. You will be successful in the interview ______ you have confidence. (福建卷)
A. before B. once C. until D. though
2. ______ environmental damage is done, it takes many years for the ecosystem (生態系統) to recover. (江蘇卷)
A. Even if B. If only C. While D. Once
【解析】兩道題都選once，均表示“一旦”。
八、in case引導的狀語從句
根據語境的不同，in case既可表示“如果”“萬一”，引導條件狀語從句;也可表示“以防(萬一)”，引導目的狀語從句。下面兩道真題均選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. (重慶卷)
A. if B. unless C. in case D. so that
【解析】兩道題都選in case，均表示“以防萬一”。
