状语从句,副词性从句,复合句的一种，简单说就是从句在句子中担任状语,分为时间、目的、地点、条件、方式、让步、比较、结果、原因9种 时间:由when,after,before,while,until,till,since,as soon as,everytime,the moment。
。。引导 地点:where,wherever 原因:because,since=now that,as 条件:if,whether,unless,as long as,on condition that,providing that 结果:so/such。
。。that,so 目的:in order that,so that 让步:though,although,however,whatever=no matter what even if,even though,as(倒装) 方式:as,as if Do it as I have told you。
比较:than,as。。。as,the more。。。,the more。
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