If he had been here yesterday,the experiment would have been successful.If you had taken your medicine yesterday,you would be better today.同样是虚拟语气,这两句话前半句都是过去完成时,为什么后半句一个是过去完成时,一个是一般过去时?
问题描述：
If he had been here yesterday,the experiment would have been successful.
If you had taken your medicine yesterday,you would be better today.
同样是虚拟语气,这两句话前半句都是过去完成时,为什么后半句一个是过去完成时,一个是一般过去时?
答
前半句都是讲过去的事.用had+过去分词.
例1的后半句也是讲过去的事.也用had+过去分词.译成：
如果他昨天在这儿,（昨天）这个实验就会成功了.
例2的后半句讲现在的事.用would+动词原形.译成：
如果你昨天服了药,你今天就会好些了.