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It won’t be long before you graduate．不久你就要毕业了。
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不等……就：
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Before Diana could stop her, she ran out．不等戴安娜拦住她，她就跑出去了。
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And before she could speak again I began to talk．不等她再讲话，我又开始谈了起来。
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I slipped out before the lecture started．不等报告开始我就溜了出来。
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张道真英语用法（大众珍藏版·第二版） [:1704917159]
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156 before (as an adverb)
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before作副词时主要表示：
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以前：
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You’ve told me all that before．这些你以前都告诉过我。
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He had never been in love before．以前他从未恋爱过。
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Have you ever been there before？你以前到过那里吗？
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（和一名词连用）前一个……，……之前的：
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The evening before, he had played bridge till midnight．前一天晚上他打桥牌一直打到深夜。
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Christmas came on Tuesday. The Monday before there was no school．星期二是圣诞节，之前的礼拜一没有课。
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He had only taken his degree a year before．他刚在一年前拿到他的学位。
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在现在多久以前用ago表示，在过去多久以前则需用before表示，试比较下面句子：
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张道真英语用法（大众珍藏版·第二版） [:1704917160]
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157 begin—start—commence
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begin和start都可以表示“开始”。可以表示：
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（某事）开始：
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When does the play begin？戏什么时候开始？
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School begins at eight o’clock．八点钟开始上课。
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The meeting started at 7．七点钟开会。
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