条件句有两类.一类是真实条件句.一类是虚拟条件句.如果假设的情况是有可能发生的.就是真实条件何.在这种真实条件句中的谓语用陈述语气.如: If it doesn’t rain tomorrow, we will go to the park. 如果明天不下雨.我们就去公园. 如果假设的情况是过去或现在都不存在的.或将来不大可能发生的.则是虚拟条件句.如: If he had seen you yesterday, he would have asked you about it. 如果他昨天见到你.他会问你这件事的.(事实上他昨天没见到你.因此也未能问你这件事.) 在含有虚拟条件句的复合句中.主句和从句的谓语都要用虚拟语气.现将虚拟条件从句和主句的动词形式列表如下: 从 句 主 句 与现在事实相反 动词的过去式 would/ should/ could/ might + 动词原形 与过去事实相反 had + 过去分词 would/ should/ could/ might + have + 过去分词 与将来事实相反 动词过去式.should + 动词原形.were to + 动词原形 would/ should/ could/ might + 动词原形 注: 主句中的should只用于I.we.但在美国英语中.should常被would代替,从句中的should 可用于各种人称. l.表示与现在事实相反的假设和结果.如: If my brother were here, everything would be all right. 要是我哥哥在这儿 .一切都没问题了.2.表示与过去事实相反的假设和结果.如: If you had taken my advice.you wouldn't have failed in the exam. 如果你按照我的建议去做.你一定不会考试不及格. 【
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