Why do you not ask your teacher for advice?

Why don't you ask your teacher for advice?

Why do you take so long to eat?

We learned why the French Revolution broke out.

I don't know the reason why he was absent.

I don't know why he quit the company.

I don't know the reason why he went there.

I like children. That's why I became a teacher.

I know the reason why Tom was angry with them.

I'm not sure why they were forced to close the restaurant.