状语从句知识点总结：原因状语从句(四大点)
<p>【导语】英语语法让很多学生都头疼，因为复杂难懂的句式和词组有时难以记忆。英语网为大家整理了英语语法大全，希望对同学们的英语语法学习有所帮助。更多内容尽在英语网。</p><p>一、引导原因状语从句的从属连词</p><p>主要的有<span word="because">because</span>, <span word="as">as</span>, <span word="since">since</span>, <span word="seeing">seeing</span> (<span word="that">that</span>), <span word="now">now</span> (<span word="that">that</span>), <span word="considering">considering</span> (<span word="that">that</span>)等：</p><p><span word="The">The</span> <span word="woolly">woolly</span> <span word="shrank">shrank</span> <span word="because">because</span> <span word="it">it</span> <span word="was">was</span> <span word="washed">washed</span> <span word="badly">badly</span>. 毛衣因洗得不得法而缩水。</p><p><span word="I">I</span> <span word="cant">cant</span> <span word="get">get</span> <span word="to">to</span> <span word="sleep">sleep</span> <span word="because">because</span> <span word="of">of</span> <span word="the">the</span> <span word="noise">noise</span> <span word="outside">outside</span>. 由于外面声音嘈杂我睡不着。</p><p><span word="Since">Since</span> [<span word="As">As</span>] <span word="weve">weve</span> <span word="no">no</span> <span word="money">money</span>, <span word="we">we</span> <span word="cant">cant</span> <span word="buy">buy</span> <span word="it">it</span>. 由于我们没钱，我们无法购买它。</p><p><span word="Seeing">Seeing</span> <span word="that">that</span> <span word="its">its</span> <span word="raining">raining</span>, <span word="wed">wed</span> <span word="better">better</span> <span word="stay">stay</span> <span word="indoors">indoors</span>. 既然外边在下雨，我们最好待在室内。</p><p><span word="Now">Now</span> <span word="that">that</span> <span word="you">you</span> <span word="are">are</span> <span word="here">here</span>, <span word="youd">youd</span> <span word="better">better</span> <span word="stay">stay</span>. 你既然来了，最好还是留下吧(既来之，则安之)。</p><p>【注】除以上提到的大家比较熟悉的引导原因状语从句的从属连词外，<span word="when">when</span>有时也可引导原因状语从句(<span word="when">when</span>表示既然)：</p><p><span word="I">I</span> <span word="cant">cant</span> <span word="tell">tell</span> <span word="you">you</span> <span word="when">when</span> <span word="you">you</span> <span word="wont">wont</span> <span word="listen">listen</span>. 既然你不想听，我就不告诉你了。</p><p>二、关于 <span word="notbecause">notbecause</span> 结构</p><p>该结构中的否定词有时否定主句，有时否定从句，一般要根据句子的意思作出正确或合乎逻辑的理解。若<span word="not">not</span>否定主句，最好在<span word="because">because</span>之前用逗号，否则会引起歧义，如下句在没有特定上下文时就有两种解释：</p>
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