中考英语语法讲解：状语从句
<p> 状语从句是句子的状语由一个从句充当，来修饰主句中的动词，形容词或副词等。状语从句都由从属连词引导，与主句连接，放在句末时，一般不在前面加逗号。</p><p> 状语从句根据它表示的意思可分为时间，原因，条件，比较，结果，目的等类。下面我们拣重点的一个一个来分析。</p><p> 时间状语从句：是由<span word="when">when</span>, <span word="as">as</span>, <span word="while">while</span>, <span word="after">after</span>, <span word="before">before</span>, <span word="since">since</span>, <span word="until">until</span>, <span word="as">as</span> <span word="soon">soon</span> <span word="as">as</span> 等从属连词引导的状语从句。时间状语从句中的谓语动词不能用一般将来时，只能用一般现在时表示将来发生的动作或存在的状态。 如:<span word="I">I</span> <span word="will">will</span> <span word="call">call</span> <span word="you">you</span> <span word="as">as</span> <span word="soon">soon</span> <span word="as">as</span> <span word="I">I</span> <span word="arrive">arrive</span> <span word="there">there</span>.</p><p> 原因状语从句： <span word="because">because</span>, <span word="since">since</span>, <span word="as">as</span>和<span word="for">for</span>都表示原因。常常令我们不知该用哪个好。我们来比较一下。<span word="because">because</span>语势最强，回答<span word="why">why</span>提出的问题，用来说明人所不知的原因。当能够很明显的看出原因或人们已知原因，就用<span word="as">as</span>或<span word="since">since</span>。如：<span word="I">I</span> <span word="dont">dont</span> <span word="like">like</span> <span word="that">that</span> <span word="coat">coat</span>,<span word="because">because</span> <span word="the">the</span> <span word="color">color</span> <span word="looks">looks</span> <span word="terrible">terrible</span>. 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>。如：<span word="He">He</span> <span word="is">is</span> <span word="not">not</span> <span word="here">here</span>, <span word="because">because</span> / <span word="for">for</span> <span word="his">his</span> <span word="mother">mother</span> <span word="is">is</span> <span word="ill">ill</span>.</p><p> 目的状语从句：表示目的状语的从句可以由<span word="in">in</span> <span word="order">order</span> <span word="that">that</span>, <span word="so">so</span> <span word="that">that</span>,等词引导。如：<span word="You">You</span> <span word="must">must</span> <span word="raise">raise</span> <span word="your">your</span> <span word="voice">voice</span> <span word="so">so</span> <span word="that">that</span>/<span word="in">in</span> <span word="order">order</span> <span word="that">that</span> <span word="everybody">everybody</span> <span word="can">can</span> <span word="hear">hear</span> <span word="you">you</span> <span word="clearly">clearly</span>.</p>
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