摘要：英语中条件从句有两类.一类是真实条件句.另一类是非真实条件句.如果假设的情况可能发生.是真实条件句,如果假设的情况是不存在的或不大可能发生的.则是虚拟条件句. A．真实条件句 真实条件句表示的假设是可能发生或实现的.主句和从句的谓语动词都要用陈述语气. If he doesn't come at 8, we won't wait for him. 如果他八点不来.我们就不等他了. If a flood happened in the past, there was usually a great loss of life and property. 过去发生洪水的话.常有很大的生命和财产损失. We shall go there unless it rains tomorrow. 如果明天不下雨.我们将去那里. I'll let you use my bike on condition that you keep it clean. 如果你能保持车子干净.我就让你用我的自行车. B．非真实条件句 在含有非真实条件句的复合句中.主句和从句的谓语动词都要用虚拟语气.其构成有三种形式: 与现在事实相反 if条件句的谓语:were did 主句的谓:would + do 与过去事实相反 if条件句的谓语:had done 主句的谓:would + have done 与将来事实相反 if条件句的谓语:didwere 主句的谓:should do would + do were to do 1． 表示与现在事实相反的条件 条件从句用动词的过去式.主句用should或would+动词原形.可用情态动词could, might代替should, would表示情态. If it were Sunday tomorrow, I would go and see my friends. 明天要是星期天的话.我就去看望我的朋友. If I were you, I should go and try. 我要是你.我就去试试. If wishes were horses, beggars might ride. 如果幻想能成为马匹.叫花子都有了坐骑 ? would go if they treated me like a slave. 要是他们把我当奴隶对待.我就走.

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