新东方英语每日一句：Had it not been for the alarm clock she wouldn't have been late.

If it had not been for the alarm clock, she wouldn have been late.其中主句和从句都与过去事实相反，因此if从句用了had+过去分词，主句用了would+不定式。我们再来看一句类似的倒装转换。 原句：If he had worked harder, he would have passed the exam. 倒装：Had he worked harder, he would have passed the exam. (实习编辑：高奕飞)