2017届高考英语高频词汇举例解析（16）
<p> ◆ <span word="because">because</span>／<span word="since">since</span>／<span word="as">as</span>／<span word="for">for</span> </p><p> 这四个词都是表示原因或理由的连接词，但是<span word="as">as</span>，<span word="because">because</span>，<span word="since">since</span>是从属连词，引导原因状语从句，<span word="for">for</span>是并列连词，所引导的不是原因状语从句，而是表示理由的对等句子，是对前面所讲内容补充和说明。在语气上由强至弱依次为<span word="because">because</span>→<span word="since">since</span>→<span word="as">as</span>→<span word="for">for</span>。<span word="because">because</span>引导的从句多置于句末，表示直接的原因或理由，表示产生那种结果的必然的因果关系，在回答<span word="why">why</span>的提问时，必须用<span word="because">because</span>作答。 如：<span word="We">We</span> <span word="stayed">stayed</span> <span word="at">at</span> <span word="home">home</span> <span word="because">because</span> <span word="it">it</span> <span word="rained">rained</span>．因为下雨我们呆在家里。 </p><p> <span word="as">as</span>与<span word="since">since</span>引导的从句多置于句首，不过<span word="as">as</span>表示十分明显的原因，只说明一般的因果关系，可译为“因为、由于”；而<span word="since">since</span>则表示稍加分析、对方已知的原因，一般可译为“既然”。如： <span word="As">As</span> <span word="he">he</span> <span word="was">was</span> <span word="not">not</span> <span word="feeling">feeling</span> <span word="well">well</span>，<span word="I">I</span> <span word="decided">decided</span> <span word="to">to</span> <span word="go">go</span> <span word="there">there</span> <span word="alone">alone</span>．由于他身体欠佳，我决定独自去那里。 <span word="Since">Since</span> <span word="everyone">everyone</span> <span word="is">is</span> <span word="here">here</span>，<span word="let">let</span>'<span word="s">s</span> <span word="start">start</span>．既然大家都到了，咱们就开始吧。 </p><p> <span word="for">for</span>引导的从句一般放在句末，其前用逗号，它所叙述的理由是间接的，即推测性理由，或是对前面叙述的事实或看法的补充说明。如： <span word="There">There</span> <span word="must">must</span> <span word="be">be</span> <span word="nobody">nobody</span> <span word="in">in</span> <span word="the">the</span> <span word="classroom">classroom</span>，<span word="for">for</span> <span word="the">the</span> <span word="light">light</span> <span word="is">is</span> <span word="off">off</span>． 教室里一定没有人，因为灯灭了。（推测性理由） </p>
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