［状语从句］原因状语从句
<p> 比较<span word="because">because</span>， <span word="since">since</span>， <span word="as">as</span>和<span word="for">for</span>：</p><p> 1）<span word="because">because</span>语势最强，用来说明人所不知的原因，回答<span word="why">why</span>提出的问题。当原因是显而易见的或已为人们所知，就用<span word="as">as</span>或 <span word="since">since</span>.例如：</p><p> <span word="I">I</span> <span word="didnt">didnt</span> <span word="go">go</span>， <span word="because">because</span> <span word="I">I</span> <span word="was">was</span> <span word="afraid">afraid</span>. 我不去是因为我怕。</p><p> <span word="Since">Since</span> /<span word="As">As</span> <span word="the">the</span> <span word="weather">weather</span> <span word="is">is</span> <span word="so">so</span> <span word="bad">bad</span>， <span word="we">we</span> <span word="have">have</span> <span word="to">to</span> <span word="delay">delay</span> <span word="our">our</span> <span word="journey">journey</span>. 天气那么糟，旅行推迟了。</p><p> 2）由<span word="because">because</span>引导的从句如果放在句末，且前面有逗号，则可以用<span word="for">for</span>来代替。但如果不是说明直接原因，而是多种情况加以推断，就只能用<span word="for">for</span>.例如：</p><p> <span word="He">He</span> <span word="is">is</span> <span word="absent">absent</span> <span word="today">today</span>， <span word="because">because</span> / <span word="for">for</span> <span word="he">he</span> <span word="is">is</span> <span word="ill">ill</span>. 他今天缺席，因为他病了。</p><p> <span word="He">He</span> <span word="must">must</span> <span word="be">be</span> <span word="ill">ill</span>， <span word="for">for</span> <span word="he">he</span> <span word="is">is</span> <span word="absent">absent</span> <span word="today">today</span>. 他一定病了，所以今天缺席。 </p><p> </p>
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