英语虚拟语气的一道题

B,这是与过去事实相反的虚拟语气,与过去事实相反的虚拟语气的公式,if+主语+had+done,主语+would/could/should have done,这句话的意思是,如果我知道,我就不会那么做了

B,这是表示非真实的过去事实相反的假设。
句型： 条件从句 主句
过去完成时 should(would) have+ 过去分词
If she had worked harder, she would have succeeded.
The rice would not have been burnt if you had been more careful.
If my lawyer had been here last Saturday, he would have prevented me from going.
If he had come yesterday, I should / would have told him about it.
含义：He did not come yesterday, so I did not tell him about it.
If he had not been ill and missed many classes, he would have made greater progress.
含义： He was ill and missed many lessons, so he did not make greater progress.

B