英语虚拟语气,假设情况中,什么叫与现在事实相反,与将来事实相反,与过去事实相反.需要举列说明.

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英语虚拟语气的大的原则是“时态倒推法”,如下：
　　与现在事实相反谓语动词用过去时,如例句所示：If I knew her telephone number,I would call her.
　　If I were a bird,I would fly aroud the world.
　　与将来事实相反用三种表示法：谓语动词用过去时；should do；were to do.
　　例句：If he came/should e/were to e tomorrow,I would go to the airport to meet him.
　　与过去事实相反谓语动词用过去完成时,例句如下：
　　If I had read that book,I would be able to answer the teacher's question now.
======以下答案可供参考======
供参考答案1:
与现在事实相反1. If I were you, I should study English.
2. I would certainly go if I had time
与过去事实相反1. If you had taken my advice, you would not have failed in the test.
2. If I had left a little earlier, I would have caught the train.
与将来事实相反1.If you came tomorrow, we would have the meeting.
2. If it were to rain tomorrow, the meeting would be put off