英语四级语法指导：状语从句

　　状语从句

　　状语从句中以下四种从句考得较多，这里给予简单介绍。

　　1) 时间状语从句

　　时间状语从句主要由以下连词引导：when, whenever, as, while, since, until, till, before, after, as soon as, once, hardly (scarcely) … when, no sooner … than。

　　I will discuss the matter with you when we meet tomorrow.

　　He didn’t go to sleep until he finished doing his homework.

　　You have changed a lot since we met last time.

　　时间状语从句还可由某些可充当连词的名词(the moment, the instant¹, every time,等)和副词(instantly, directly²等)引导：

　　I will tell you the news the instant I know.

　　Directly the teacher came in everyone was quiet.

　　Note:

　　① before除了可表示 “在…之前”外，还可用来强调主句所表达的时间、距离很长或花费的力量相比较大，可译为“…才”。(“not … before” 可用来强调主句所表达的时间、距离很短或花费的力量相比较小，可译为“…就”)。

　　It was a long time before I got to sleep again.

　　They had not been married a month before they quarreled.

　　② 如果位于when引导的分句之前的主句使用过去进行时、过去完成时或“was/were about to, was/were on the point of”等结构时，when表示突然发生某事，可译为“正在…突然”或“刚…就”等。这时，不能够用as或while来代替when。

　　I was walking on the street when I ran into my old friend John.

　　She had just fallen asleep when the telephone rang.

　　We were about to leave when it began to rain.

　　2) 条件状语从句

　　条件状语从句主要由以下连词引导：if, unless, providing/provided³ (that), suppose/supposing (that), on condition (that), as/so long as, in case等。

　　So long as you work hard, you will surely⁴ achieve good results in examinations⁵.

　　I shall return next Thursday unless something unexpected⁶ happens.

　　I will go provided that you go with me.

　　Please give this letter to John in case he comes.

　　3) 让步状语从句

　　让步状语从句主要由以下连词引导：though, although, even if, even though, whatever, however, whoever⁷, wherever, no matter how/ what/ where/ when等。以下介绍几种较特殊的让步状语从句。

　　(1) while引导的让步状语从句多放在句首，while相当于although，表示“尽管”，“虽然”。

　　While I admit I did it, I didn’t intend to.

　　While I understand what you say, I can’t agree with you.

　　(2) 短语“even now/then/so”相当于“though it is/was true”，表示“尽管如此”，“尽管这样”。

　　The fire was out, but even so, the smell of smoke was strong.

　　I’ve tried my best, but even now/then she is not satisfied⁸.

　　(3) as引导的让步状语从句要倒装。

　　Child as he was, he could speak four languages.

　　Hard as she tried, she failed to get the job.

　　4) 比较状语从句

　　比较状语从句主要由以下连词引导：(not) as … as, (not) the same as, (not) such … as, not so … as, than, the + 比较级…, the +比较级…等。

　　We have had a lot more rainfall this year than we had last year.

　　She can speak English as fluently⁹ as her teacher (can).

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