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151 because—as—since—for
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这四个词的意思有些接近，都可译为“因为”，但它们中间也有一些差异：
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because一般指出直接的原因，在回答why引起的问句时都会用它：
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Why didn’t you go to the concert?—Because I had a bad headache．为什么你没去听音乐会？—因为我头疼得厉害。
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He distrusted me because I was new．他不信任我是因为我是新来的。
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because引导的从句，通常放在主句后面，但为了强调也可放在前面：
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Because I worked fast, I finished early．因为我干得快，所以我完成得早。
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as和since引导的原因从句常可放在前面：
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As all the seats were full I stood up．因为所有座位都有人，我就站了起来。
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Since we’ve no money, we can’t buy it．因为我们没有钱，我们没法买它。
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有时也可放在后面：
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We didn’t know what to do as we are not his parents．我们不知怎么办好，因为我们不是他的父母。
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He could not answer the question, since he had not made up his mind．他不能回答这个问题，因为他还没拿定主意。
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for用在书面语中的时候较多，引起的分句对前面的话进行解释，常用逗号把它和前面的分句分开：
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He shook his head, for he thought differently．他摇了摇头，因为他有不同想法。
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The days were short, for it was now December．白天很短，因为这时已经是12月。
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这种用法已经有些老式。
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另外because of也表示原因，但后面总是跟名词（或代词）：
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She won’t come out because of asthma．由于气喘她不想出来。
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Because of this we decided to leave early．由于这个我们决定早些动身。
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152 become—get—grow—come—go—turn—run—fall
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become是一个系动词，表示“变成”，后面可以跟：
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名词：
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Naturally he became chairman of the commission．自然他成了委员会主任。
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