Their relationship is very complicated.

The parent and child went to the park to play.

There is a park between my house and school.

The other day, I went to a new restaurant.

While he was taking a nap, I finished my homework.

This problem is very difficult.

The difficulty of this problem makes me scratch my head.

This problem is so difficult to solve, it gives me a headache.

Well, who could be visiting at this hour?

This room is spacious, and the space is very wide.