职称英语语法辅导：状语从句
<p> 一、状语从句的概念和类别</p><p> 状语从句指句子用作状语时，起副词作用的句子。它可以修饰谓语、非谓语动词、定语、状语或整个句子。根据其作用可分为时间、地点、原因、条件、目的、结果、让步、方式和比较等从句。状语从句一般由连词引导，也可以由词组引起。从句位于句首或句中时通常用逗号与主句隔开，位于句尾时可以不用逗号隔开。</p><p> 二、考点聚焦</p><p> 1、时间状语从句</p><p> <span word="as">as</span>、<span word="when">when</span>、<span word="while">while</span>用法</p><p> <span word="as">as</span>表示当的时候，往往和<span word="when">when</span>/ <span word="while">while</span>通用，但它着重强调主句与从句的动作或事情同时或几乎同时发生。</p><p> <span word="She">She</span> <span word="came">came</span> <span word="up">up</span> <span word="as">as</span> <span word="I">I</span> <span word="was">was</span> <span word="cooking">cooking</span>。</p><p> <span word="The">The</span> <span word="runners">runners</span> <span word="started">started</span> <span word="as">as</span> <span word="the">the</span> <span word="gun">gun</span> <span word="went">went</span> <span word="off">off</span>。</p><p> <span word="when">when</span>:既可以表示在某一点的时候，又可表示在某一段时间内，主句与从句的动作或事情可以同时发生也可以先后发生。</p><p> <span word="It">It</span> <span word="was">was</span> <span word="raining">raining</span> <span word="when">when</span> <span word="we">we</span> <span word="arrived">arrived</span>。</p><p> <span word="When">When</span> <span word="we">we</span> <span word="were">were</span> <span word="at">at</span> <span word="school">school</span>, <span word="we">we</span> <span word="went">went</span> <span word="to">to</span> <span word="the">the</span> <span word="library">library</span> <span word="every">every</span> <span word="day">day</span>。</p><p> <span word="while">while</span>意思是当的时候或在某一段时间里。主句中的动作或事情在从句中的动作或事情的进展过程中发生，从句中的动词一般要用延续性动词。在<span word="when">when</span>表示<span word="a">a</span> <span word="period">period</span> <span word="of">of</span> <span word="time">time</span>时，两者可以互换。</p><p> <span word="Please">Please</span> <span word="dont">dont</span> <span word="talk">talk</span> <span word="so">so</span> <span word="loud">loud</span> <span word="while">while</span> <span word="others">others</span> <span word="are">are</span> <span word="working">working</span>。</p>
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