Commuting to school by train every day is tough.

I commute to school by train every day.

I have been communicating with him for a long time.

He has expertise in computer science.

He is well acquainted with Japanese.

He used a radar to search for the ship.

Yoshimichi is my best friend.

Kodo is my best friend.

Tsuneaki is my best friend.

He is well-informed, so he quickly grasped the core of the problem.