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状语从句

一、考点梳理。

1.考查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。

【例】 Leave your key with a neighbor____you lock yourself out one day. A. ever since B.even if C.soon after D. in case

【例】My parents live in a small village. They always keep candles in the house__there is a power cut.

A. if B.unless C.in case D. so that

答案为C。in case在此引导目的状语从句，意为“以防”。 2.考查before引导的状语从句

尤其要注意“It+be+--段时间+before...”这一句型。

【例】 The field research will take Joan and Paul about five months; it will be a long time____we meet them again.

A. after B.before C.since D.when

答案为B。it will be a long time before...的意思是“要过很久才会??”。 【例】He was told that it would be at least three more months____he could recover and return to work.

A. when B.before C.since D. that

答案为B it was some time before...的意思是“在??之前过了一段时间”，通常可转译为“过了一段时间才??”。又如：It was a long time before I got to sleep again．过了好久我才又睡着。 3.考查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，而是让步状语从句一一此用法许多同学并不熟悉，值得特别注意）。 【例】____I really don't like art,I find his work impressive.

A. As B.Since C.If D.While

答案为Do while在此表示“尽管”、“虽然”，又如：While the question was difficult to answer,it was interesting．尽管问题很难回答，但很有趣。

另外，while表示对比的用法也值得注意（此时它表示“而”）。例如：

【例】The cost of living in Glasgow is among the lowest in Britain,__the quality of life is probably one of the highest. A. since B.when C.as D.while

4.考查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”。 【例】 --Where's that report? --I gave it to you___you came in. A. if B.when C.because D. before

答案为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：当你进来时我就给你了。 需要注意的是，when还有?个用法，就是表示“既然”，也是一个值得注意的考点。例如：

【例】 Why do you want a new pen__you've got such a good one already? A. that B.where C.which D. when

答案为D。when在此表示“既然”。 还有一点也需注意，就是when表示“这时（突然）”的用法。例如：

【例】I had just stepped out of the bathroom and was busily drying myself with a towel_____I heard the steps．

A. while B.when C.since D. after

【例】 He was about halfway through his meal__a familiar voice came to his ears. A. why B.where C.when D.while 以上两题答案均选when，其意均表示“这时”。 5.考查unless引导的状语从句

unless的意思是“如果不??”、“除非”，对于涉及unless的考题，一般只要能读懂句意，弄清语境，就不会有问题。

【例】 Most birds find it safe to sleep in the trees, but__they have eggs or young chicks, they don't use a nest.

A. why B.how C.unless D.where

【例】I won't call you,____something unexpected happens. A. unless B.whether C.because D.while 以上两题答案为均选unless，其意均表示“除非”。 6.考查until引导的状语从句

until的意思是“直到??时”、“在??之前”，对于涉及until的考题，一般只要能读懂句意，弄清语境，就不会有问题。

【例】 It is difficult for us to learn a lesson in life____we've actually had that lesson.

A. until B.after C.since D.when

答案为A。将四个选项逐一填入空格处，只有填until时，意思最通顺。 另外，还要注意not...until...这一句式（直到??才??）。例如：

【例】\again,\

A. because B.since C.when D.until

答案为D。until与前面的not相呼应，表示“直到??才??”。 7.考查once引导的状语从句

once的意思是“一旦”，对于涉及once的考题，一般只要能读懂句意，弄清语境，就不会有问题。

【例】You will be successful in the interview____you have confidence. A. before B.once C.until D.though

【例】——environmental damage is done, it takes many years for the ecosystem（生态系统）to recover.(2006江苏卷)

A. Even if B.If only C.While D.Once 两道题均选once，均表示“一旦”。 8.考查where引导的状语从句

where可以用于引导地点状语从句，其意为“在??的地方”，此用法许多同学都不熟悉，但高考经常考查，应引起特别注意。