虚拟语气

2016北京对口升学培训学校?表示所说的不是事实，或者是不可能发生的情况，而只是一种愿望，假设或猜测。

1. 表示和现在事实相反的假设：He is honest. If he were dishonest， I should not trust him. 他是诚实的。如果他不诚实的话，我就不会信任他。

He is not alive. If he were alive today， he would be a hero. 他死了。如果他今天活着的话，他会是个英雄。

If there were no air， there would be no living things. 如果没有空气，就没有生物。

If there were no gravity， we should not be able to walk. 如果没有引力，我们就不能行走。

In fact， I am not there. If I were there， I could solve the problem by myself. 事实上，我没有在那里。如果我在那里的话，我自己就能解决这个问题。

2. 表示和过去事实相反的假设：If there had been no air， there would have been no living things. 如果当初没有空气，也就没有生物了。

You didn't come here yesterday. If you had come here yesterday， you would have seen him.昨天你没有来。如果昨天你到这里来了的话，你就看见他了。

If had not obeyed him， I might have been punished. 要是我那时不服从他的话，我可能受处分。

3.和将来事实相反的假设：if从 句　 主 句should+ 动词原形　 should（would）+ 动词原形were to+动词原形动词过去式

If he should be here tomorrow， he would call me up. 万一他明天来这里的话，他会给我打电话的。（来的可能性很小）

If it were to rain tomorrow， the match would be cancelled. 万一明天下雨的话，就将取消比赛。（下雨的可能性极小）

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