He hardly remembers Japanese.

He has a hard time learning Japanese.

He is quite a good cook.

I think his Japanese has improved quite a bit, hasn't it?

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.

This is the most difficult case I have ever faced.

He couldn't hide his indignation at his dishonesty.

Mr. Kusanagi is tilling the field.