How come VS Why

有时会听到有人会以“How come” 来代替“ Why”来交谈；但我们必须注意的是“How come”是用来交谈，不用来写作！还有“How come” 与“ Why”在句子的文法构造有不同。

1. Why are you late ?

2. Why did you buy?

3. Why did Peter do it?

4. Why were they going there?

看看以下用“How come”的文法构造有不同点

1. How come you are late?

2. How come you bought it ?

3. How come Peter did it?

4. How come they were going there?