职称英语理工类语法词汇常见考点：时间状语从句
<p> 状语从句在复合句中作状语，修饰主句中的谓语动词、副词、形容词或整个句子。根据句子的含义，它可表时间、地点、原因、目的、结果、条件、行为方式、比较、让步等。状语从句通常由一个连词引起，有时由一个起连词作用的词组引起。</p><p> 一.时间状语从句</p><p> <span word="I">I</span>) <span word="when">when</span>，<span word="while">while</span>和<span word="as">as</span></p><p> <span word="He">He</span> <span word="entered">entered</span> <span word="the">the</span> <span word="room">room</span> <span word="when">when</span> <span word="the">the</span> <span word="meeting">meeting</span> <span word="was">was</span> <span word="going">going</span> <span word="on">on</span>.</p><p> <span word="when">when</span> 通常指一时的动作或状态，可表示从句动作与主句动作同时发生，或先于主句动作;<span word="while">while</span>常用来引导两个同时进行的持续时间较长的动作;<span word="as">as</span>常用来引导两个动作紧接着发生，强调同一时间或一前一后。</p><p> <span word="When">When</span> <span word="I">I</span> <span word="meet">meet</span> <span word="the">the</span> <span word="right">right</span> <span word="chance">chance</span>, <span word="I">I</span> <span word="will">will</span> <span word="try">try</span> <span word="my">my</span> <span word="best">best</span>.</p><p> <span word="While">While</span> <span word="the">the</span> <span word="teacher">teacher</span> <span word="explained">explained</span> <span word="the">the</span> <span word="text">text</span>, <span word="the">the</span> <span word="students">students</span> <span word="listened">listened</span> <span word="attentively">attentively</span> <span word="and">and</span> <span word="took">took</span> <span word="notes">notes</span></p><p> <span word="He">He</span> <span word="sang">sang</span> <span word="songs">songs</span> <span word="as">as</span> <span word="he">he</span> <span word="was">was</span> <span word="taking">taking</span> <span word="a">a</span> <span word="bath">bath</span>.</p><p> <span word="As">As</span> <span word="spring">spring</span> <span word="warms">warms</span> <span word="the">the</span> <span word="earth">earth</span>, <span word="all">all</span> <span word="flowers">flowers</span> <span word="begin">begin</span> <span word="to">to</span> <span word="bloom">bloom</span>.</p><p> 注：<span word="when">when</span>有时作并列连词意为正在这时、突然，在句末，不能位于句首。从句的谓语动词常用一般过去时，主句通常用过去进行时、过去完成时或<span word="be">be</span> <span word="about">about</span> <span word="to">to</span>结构等。</p><p> <span word="She">She</span> <span word="was">was</span> <span word="about">about</span> <span word="to">to</span> <span word="leave">leave</span> <span word="when">when</span> <span word="Mark">Mark</span> <span word="arrived">arrived</span> <span word="so">so</span> <span word="she">she</span> <span word="stayed">stayed</span> <span word="a">a</span> <span word="little">little</span> <span word="longer">longer</span>.</p><p> <span word="He">He</span> <span word="had">had</span> <span word="been">been</span> <span word="walking">walking</span> <span word="under">under</span> <span word="the">the</span> <span word="trees">trees</span> <span word="when">when</span> <span word="an">an</span> <span word="apple">apple</span> <span word="fell">fell</span> <span word="down">down</span>.</p>
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