4月的大学英语六级考试逻辑连接词辨析
<p> 当时候: <span word="as">as</span>, <span word="when">when</span>, <span word="while">while</span></p><p> :<span word="when">when</span>从句谓语动词所表示的动作可以发生在主句谓语动词所表示的动词之前，而<span word="while">while</span>和<span word="as">as</span>从句谓语动词表示的动作一般都与主句谓语动词同时发生;</p><p> :<span word="when">when</span>/<span word="as">as</span>从句表示的时间可以是某一瞬间或某一点，而<span word="while">while</span>从句不能只时间的一点，因为<span word="while">while</span>意为<span word="for">for</span> <span word="as">as</span> <span word="long">long</span> <span word="as">as</span>或<span word="during">during</span> <span word="the">the</span> <span word="time">time</span> <span word="that">that</span></p><p> :当<span word="as">as</span>,<span word="when">when</span>,<span word="while">while</span>表示两个动作同时发生时，一般而言，<span word="while">while</span>表示的动作持续时间较长，而<span word="as">as</span>/<span word="when">when</span>表示的动作持续的时间较短;</p><p> :可用<span word="when">when</span>/<span word="while">while</span>+<span word="doing">doing</span>，但<span word="as">as</span>不行</p><p> :<span word="while">while</span>从句的动词即可表动作又可表状态，而<span word="as">as</span>从句中的动词只能表示动作;</p><p> :<span word="when">when</span>引导的从句也可以是新信息，这是<span word="when">when</span>作<span word="and">and</span> <span word="at">at</span> <span word="this">this</span> <span word="moment">moment</span>或<span word="and">and</span> <span word="then">then</span>讲，意为这时突然或然后。</p><p> 因为：<span word="because">because</span>, <span word="as">as</span>, <span word="since">since</span>, <span word="for">for</span></p><p> <span word="Because">Because</span>:从句是重点，一般位于主句之后;</p><p> <span word="As">As</span>:主句是重点，原因只是附带说明，不能用于回答<span word="why">why</span></p><p> <span word="Since">Since</span>:意思与<span word="as">as</span>相近，但是语气更加强和正式，用来表示显然的，已知的理由;</p><p> <span word="For">For</span>:理由只是补充说明，有时相当于<span word="because">because</span>，即可表直接原因，但有时则不可，例如：</p><p> <span word="The">The</span> <span word="ground">ground</span> <span word="is">is</span> <span word="wet">wet</span> <span word="this">this</span> <span word="morning">morning</span>, <span word="for">for</span>/<span word="because">because</span> <span word="it">it</span> <span word="rained">rained</span> <span word="last">last</span> <span word="night">night</span>.</p>
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