备战职称英语考试：重点语法解析(7)
<p> 表示不知道的原因时用<span word="because">because</span>,即说话人认为听话人不知道,因此<span word="because">because</span>从句是全句最重要的部分,通常它被置于主句之后.</p><p> <span word="You">You</span> <span word="want">want</span> <span word="to">to</span> <span word="know">know</span> <span word="why">why</span> <span word="Im">Im</span> <span word="leaving">leaving</span>? <span word="Im">Im</span> <span word="leaving">leaving</span> <span word="because">because</span> <span word="Im">Im</span> <span word="full">full</span>.</p><p> <span word="for">for</span>虽然表示不知道的原因,但其语气较<span word="because">because</span>要弱得多,是可说可不说的话,它只能置于主句之后,这时,<span word="for">for</span>是并列连词.如果不是因果关系,而是对前面主句的内容加以解释或推断时,只能用<span word="for">for</span>.如:<span word="Its">Its</span> <span word="morning">morning</span> <span word="now">now</span>, <span word="for">for</span> <span word="the">the</span> <span word="birds">birds</span> <span word="are">are</span> <span word="singing">singing</span>.</p><p> 表示已经知道的原因时用<span word="as">as</span>或<span word="since">since</span>,即某种原因在说话人看来已经很明显,或已为听话人所熟悉,因此它是句中不很重要的部分.<span word="since">since</span>要比<span word="as">as</span>正式一些,它们通常被置于语句之前,但有时却相反</p><p> <span word="Seeing">Seeing</span> <span word="all">all</span> <span word="of">of</span> <span word="the">the</span> <span word="children">children</span> <span word="already">already</span> <span word="seated">seated</span>, <span word="he">he</span> <span word="said">said</span>,<span word="Since">Since</span> <span word="everyone">everyone</span> <span word="is">is</span> <span word="here">here</span>, <span word="lets">lets</span> <span word="start">start</span>.</p><p> 下列情况下只能使用<span word="because">because</span>:</p><p> ①在回答<span word="why">why</span>的问句时;</p><p> ②在用于强调句型时;</p><p> ③被<span word="not">not</span>所否定时.</p><p> </p>
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