Since that's his own concern, we better not interfere.

He should stop his selfish behavior.

This ancient proverb, 'know the other side and yourself, and you will not be in danger in a hundred battles', teaches us the importance of understanding ourselves and others.

When will you go to Japan?

When are you going to Japan?

He will help at any time.

No one is allowed to break the law.

What is your nationality?

How many people are coming to the party?

What kind of person is he?