高二英语语法解析：状语从句
<p> 由从句担任的状语，在句子中可修饰谓语（或其他动词）、形容词、副词或是整个句子，它可以用来表示时间、地点、原因、目的、结果、条件、方式、比较、让步 等。状语从句是一较大的语法项目，也是近几年高考题中常见的一个重要试点。高考中已考查了时间、让步、地点、条件、目的等状语从句，这些从句仍是今后高考 热点，应作充分准备。同时对方式状语从句也应引起重视。</p><p> </p><p> 一、时间状语从句</p><p> </p><p> 表示时间的状语从句可由<span word="when">when</span>， <span word="as">as</span>， <span word="while">while</span>， <span word="whenever">whenever</span>， <span word="after">after</span>， <span word="before">before</span>， <span word="till">till</span> （<span word="until">until</span>）， <span word="since">since</span>， <span word="once">once</span>， <span word="as">as</span> <span word="soon">soon</span> <span word="as">as</span> （或<span word="the">the</span> <span word="moment">moment</span> ）， <span word="by">by</span> <span word="the">the</span> <span word="time">time</span>， <span word="no">no</span> <span word="sooner">sooner</span><span word="than">than</span>， <span word="hardly">hardly</span> （<span word="scarcely">scarcely</span>）<span word="when">when</span>， <span word="every">every</span> <span word="time">time</span>等引导。</p><p> </p><p> <span word="e">e</span>.<span word="g">g</span>. <span word="When">When</span> <span word="I">I</span> <span word="came">came</span> <span word="into">into</span> <span word="the">the</span> <span word="office">office</span>， <span word="the">the</span> <span word="teachers">teachers</span> <span word="were">were</span> <span word="having">having</span> <span word="a">a</span> <span word="meeting">meeting</span>.</p><p> </p><p> <span word="He">He</span> <span word="started">started</span> <span word="as">as</span> <span word="soon">soon</span> <span word="as">as</span> <span word="he">he</span> <span word="received">received</span> <span word="the">the</span> <span word="news">news</span>.</p><p> </p><p> <span word="Once">Once</span> <span word="you">you</span> <span word="see">see</span> <span word="him">him</span>， <span word="you">you</span> <span word="will">will</span> <span word="never">never</span> <span word="forget">forget</span> <span word="him">him</span>.</p><p> </p><p> <span word="No">No</span> <span word="sooner">sooner</span> <span word="had">had</span> <span word="I">I</span> <span word="gone">gone</span> <span word="to">to</span> <span word="bed">bed</span> <span word="than">than</span> <span word="I">I</span> <span word="went">went</span> <span word="to">to</span> <span word="sleep">sleep</span>.</p><p> </p><p> 二、原因状语从句</p><p> </p><p> 原因状语从句是表示原因或理由的，引导这类从句的最常用的连词是<span word="because">because</span>， <span word="since">since</span>， <span word="as">as</span> ， <span word="now">now</span> <span word="that">that</span>（既然）等，<span word="for">for</span> 表示因果关系时（它引导的不是从句）为并列连词，语气不如<span word="because">because</span>强。</p>
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