中考英语重要短语的用法及区别：as when while
<p> 中考英语重要短语的用法及区别：<span word="as">as</span> , <span word="when">when</span> , <span word="while">while</span></p><p> <span word="When">When</span>：可与一个点的时间或表示一段的时间连用，从句动词可以是短暂性或延续性动词。从句的动作和主句的动作可以同时，也同先于主句的动作。</p><p> <span word="When">When</span> <span word="the">the</span> <span word="teacher">teacher</span> <span word="came">came</span> <span word="in">in</span> , <span word="the">the</span> <span word="students">students</span> <span word="stood">stood</span> <span word="up">up</span> . 当老师进来时，学生们起立。</p><p> <span word="While">While</span>：只指一段时间，不能指一点时间。因此<span word="while">while</span>从句中的谓语动词必须是延续性动词。表示一段较长的时间或一个过程，主句和从句的动作同时发生。</p><p> <span word="Don">Don</span>'<span word="t">t</span> <span word="talk">talk</span> <span word="while">while</span> <span word="you">you</span> <span word="are">are</span> <span word="eating">eating</span> . 吃饭时你不要说话。</p><p> <span word="As">As</span>：主句和从句的动作同时发生，有时可译作“一边……，一边”。</p>
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