1. 现在虚拟语气:

I wish I were a bird so that I could fly to the moon.
我希望自己能变成一只鸟,那样我就能飞到月球上了。
2. 过去虚拟语气:
If I had known about the traffic jam, I wouldn't have left so early.
如果我知道会有交通堵塞,我就不会那么早出发了。
3. 将来虚拟语气:
I would have finished the project by now if I had more time.
如果我有更多的时间,我现在就已经完成这个项目了。