一、in case引導(dǎo)的狀語從句

根據(jù)語境的不同，in case既可表示“如果”“萬一”，引導(dǎo)條件狀語從句;也可表示“以防(萬一)”，引導(dǎo)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”。

二、before引導(dǎo)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題涉及的句式為：It will be a long time before…，意思是“要過很久才會……”;第2題涉及的句式為：it was some time before…，意思是“在……之前過了一段時間”，通�？赊D(zhuǎn)譯為“要過一段時間才會……”。

三、while引導(dǎo)的狀語從句

尤其要注意while表示“盡管”“雖然”時的用法(此時它引導(dǎo)的不是時間狀語從句，而是讓步狀語從句——此用法許多同學(xué)并不熟悉，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“盡管”“雖然”，又如：While the work was difficult, it was interesting. 盡管工作有難度，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(dǎo)的狀語從句

對于when的用法，同學(xué)們最熟悉的是表示“當(dāng)……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(xiàng)逐一填入空格處，只有填when時，意思最通順。句意為：當(dāng)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：

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