This problem is very difficult.

It's difficult to collect character tiles in mahjong.

I like to play mahjong with my friends on weekends.

We need to gather the resources necessary to make the project successful.

The child was playing in the park.

We were able to gather everyone.

Man is my best friend.

Mr. Wan is my best friend.

Mr. Wan is my best friend.

This picture is being sold for ten thousand yen.