初中英语状语从句知识点：原因状语从句
<p> 原因状语从句</p><p> 连词有：<span word="because">because</span> <span word="as">as</span> <span word="since">since</span> <span word="now">now</span> <span word="that">that</span>等</p><p> (1) 区分<span word="because">because</span>, <span word="as">as</span>, <span word="since">since</span>, <span word="for">for</span></p><p> ① <span word="because">because</span>表示人们不知道的直接的原因或理由，着重点在从句，其所引导的从句，为全句句意的中心所在。通常用于回答<span word="why">why</span>引出的疑问句，语气最强，除特别强调外，该从句一般位于主句后面，不能与<span word="so">so</span>连用但是可以与<span word="so">so</span>进行同义句转换。</p><p> <span word="I">I</span> <span word="didnt">didnt</span> <span word="go">go</span> <span word="aboard">aboard</span> <span word="with">with</span> <span word="her">her</span> <span word="because">because</span> <span word="I">I</span> <span word="couldnt">couldnt</span> <span word="afford">afford</span> <span word="it">it</span>.</p><p> 我没有和她一起出国是因为费用太高。</p><p> ② <span word="as">as</span>引导的原因状语从句所传递的通常是已知信息，从句多位于主句之前，表示双方那个已知的理由，如：</p><p> <span word="As">As</span> <span word="I">I</span> <span word="didnt">didnt</span> <span word="know">know</span> <span word="the">the</span> <span word="way">way</span>，<span word="I">I</span> <span word="asked">asked</span> <span word="a">a</span> <span word="policeman">policeman</span>.</p><p> 我不认识路，因而问警察。</p><p> ③ <span word="since">since</span>引导的原因状语从句多表示大家众所周知的理由，如：</p><p> <span word="Since">Since</span> <span word="traveling">traveling</span> <span word="by">by</span> <span word="air">air</span> <span word="is">is</span> <span word="much">much</span> <span word="faster">faster</span>, <span word="they">they</span> <span word="decided">decided</span> <span word="to">to</span> <span word="take">take</span> <span word="a">a</span> <span word="plane">plane</span>.</p><p> 既然乘飞机旅行快得多，他们就决定坐飞机。</p><p> ④ <span word="for">for</span>表示的理由是附加的或推断的，并非此原因，通常与主句用逗号隔开，不位于句首，如：</p><p> <span word="He">He</span> <span word="must">must</span> <span word="be">be</span> <span word="not">not</span> <span word="at">at</span> <span word="home">home</span>, <span word="for">for</span> <span word="the">the</span> <span word="telephone">telephone</span> <span word="isnt">isnt</span> <span word="answered">answered</span>.</p><p> 用<span word="because">because</span>, <span word="as">as</span>, <span word="since">since</span>, <span word="for">for</span> 填空：</p>
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