在英语四六级考试中，状语从句的考点一般围绕时间、条件、比较、让步四类开展，在不同年份、不同题型中均有涉及。定语从句涉及到的考点可谓多种多样，形形色色，也应次一直备受各位考生重视。那么，考试中经常涉及的定语从句有哪几类呢？应该掌握哪些重要知识点？赶紧跟随北外网课（北京外国语大学网络课堂）老师，一起来学学吧。
条件状语从句一般由if,unless, providing/provided (that), suppose/supposing (that), on condition(that), as/so long as, in case等连词引导。
I shall return next Thursday unless something unexpectedhappens.
Please give this letter to John in case he comes.
比较状语从句一般由(not)as „ as, (not) the same as, (not) such „ as, not so „ as, than,the + 比较级„, the +比较级„等以下连词引导。
She can speak English as fluently as her teacher (can).
时间状语从句一般由when,whenever, as, while, since, until, till, before, after, as soon as, once,hardly (scarcely) „ when, no sooner „ than等连词引导，还可由某些可充当连词的名词（the moment, the instant, every time,等）和副词（instantly,directly等）引导。
I will discuss the matter with you when we meet tomorrow.
You have changed a lot since we met last time.
Directly the teacher came in everyone was quiet.
①before除了可形容“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”）。
②若位于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形容突然发生某事，可译为“正在„突然”或“刚„就”等。这时，不能够用as或while来代替when。
让步状语从句一般由though,although, even if, even though, whatever, however, whoever, wherever, no matterhow/ what/ where/ when等连词引导。
(1) while引导的让步状语从句多置于句首，while相当于although，形容“尽管”，“虽然”。
While I understand what you say, I can’t agree with you.
(2) “even now/then/so”相当于“though it is/was true”，形容“尽管如此”，“尽管这样”。
I’ve tried my best, but even now/then she is not satisfied.
(3) as引导的让步状语从句要倒装。
Child as he was, he could speak four languages.
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