假設語氣

過去事實相反

現在事實相反

未來

小可

不可

大可

If he/we were rich ,
he could buy a house

If he had $, he would buy a house.

If he had been rich, he could have bought a house.

If he had had $, he would have bought a house.

If he is rich, he will buy a house.

If he eats my cake, I will cry.

If it rains tomorrow, I will not come.

If he should be rich, he can/could buy a house.

If it should rain, I will/would not come.

If he were to be rich, he could buy a house.

If it were to rain tomorrow, I wouldn't go out.

Had he been rich, he....

Had he had money, he .......

Were he rich, he......

Should he be rich, he......

Should it rain, I......

It is (high/ about) time that you went to bed.