2016年中考英语词组辨析：as/ when/ while
<p> 这三个词都可以用作连词，表时间关系， 但有区别：</p><p> Ⅰ. <span word="as">as</span> “当(在)……时候”往往可与<span word="when">when</span> 或 <span word="while">while</span> 通用，但它着重指主句和从句的动作或事情相并发生。如：</p><p> ① <span word="I">I</span> <span word="saw">saw</span> <span word="him">him</span> <span word="as">as</span> <span word="he">he</span> <span word="was">was</span> <span word="getting">getting</span> <span word="off">off</span> <span word="the">the</span> <span word="bus">bus</span>. 当下公共汽车的时候，我看见了他。</p><p> ② <span word="As">As</span> <span word="he">he</span> <span word="walked">walked</span> <span word="on">on</span>, <span word="he">he</span> <span word="felt">felt</span> <span word="himself">himself</span> <span word="getting">getting</span> <span word="more">more</span> <span word="and">and</span> <span word="more">more</span> <span word="tired">tired</span>.他继续往前走的时候，感到越来越疲乏。</p><p> Ⅱ. <span word="when">when</span> “当(在)……的时候”主句和从句的动作或事情可以同时发生，也可以先后发生。</p><p> ① <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>. 当我们到达的时候，正下着雨。</p><p> ② <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>. 我们在求学的时候，每天都到图书馆去。</p><p> Ⅲ. <span word="while">while</span> “当(在)……的时候”表主句的动作或事情发生在从句中的动作或事情的进展过程之中。从句通常为进行时态。它有时可与<span word="when">when</span>通用，但它只能指一段时间 (<span word="a">a</span> <span word="period">period</span> <span word="of">of</span> <span word="time">time</span>),而不能指一点时间(<span word="a">a</span> <span word="point">point</span> <span word="of">of</span> <span word="time">time</span>)如上面的第一个例子。又如：</p><p> ① <span word="Please">Please</span> <span word="don">don</span>’<span word="t">t</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>. 别人在工作的时候，请勿大声讲话。</p><p> ② <span word="While">While</span> <span word="I">I</span> <span word="am">am</span> <span word="washing">washing</span> <span word="the">the</span> <span word="floor">floor</span>, <span word="you">you</span> <span word="can">can</span> <span word="be">be</span> <span word="cleaning">cleaning</span> <span word="the">the</span> <span word="windows">windows</span>.我洗地板时，你可以擦窗户。</p>
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