状语从句知识点总结：when, while, as的用法区别
<p>【导语】英语语法让很多学生都头疼，因为复杂难懂的句式和词组有时难以记忆。英语网为大家整理了英语语法大全，希望对同学们的英语语法学习有所帮助。更多内容尽在英语网。</p><p>三者可表示当时候，区别如下：</p><p>(1) 若主句表示的是一个短暂性动作，从句表示的是一个持续性动作，三者都可用：</p><p><span word="He">He</span> <span word="fell">fell</span> <span word="asleep">asleep</span> <span word="when">when</span> [<span word="while">while</span>, <span word="as">as</span>] <span word="he">he</span> <span word="was">was</span> <span word="reading">reading</span>. 他看书时睡着了。</p><p>【注】<span word="as">as</span> 用于引出一个持续性动词表示在期间时，其谓语通常只能是那些含有动作(<span word="action">action</span>)和发展(<span word="development">development</span>) 意味的动词，一般不能是那些不用于进行时态的动词(如 <span word="be">be</span>, <span word="seem">seem</span>, <span word="love">love</span>, <span word="want">want</span>, <span word="agree">agree</span>, <span word="see">see</span>, <span word="know">know</span>, <span word="have">have</span> 等)，所以下面一句中的 <span word="while">while</span> 不能换为 <span word="as">as</span>：</p><p><span word="A">A</span>：<span word="Im">Im</span> <span word="going">going</span> <span word="to">to</span> <span word="the">the</span> <span word="post">post</span> <span word="office">office</span>. 我要去邮局。</p><p><span word="B">B</span>：<span word="While">While</span> <span word="youre">youre</span> <span word="there">there</span>, <span word="can">can</span> <span word="you">you</span> <span word="get">get</span> <span word="me">me</span> <span word="some">some</span> <span word="stamps">stamps</span>? 当你在邮局时，能帮我买几张邮票吗?</p><p>(2) 若主、从句表示两个同时进行的持续性动作，且强调主句表示的动作延续到从句所指的整个时间，通常要用 <span word="while">while</span>：</p><p><span word="Dont">Dont</span> <span word="talk">talk</span> <span word="while">while</span> <span word="youre">youre</span> <span word="eating">eating</span>. 吃饭时不要说话。</p><p><span word="I">I</span> <span word="kept">kept</span> <span word="silent">silent</span> <span word="while">while</span> <span word="he">he</span> <span word="was">was</span> <span word="writing">writing</span>. 在他写的时候，我默不作声。</p><p>但是，若主从句表示的两个同时进行的动作含有一边一边之意思，通常用 <span word="as">as</span>：</p>
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