Jin is my best friend.

That person is my friend.

He is not only an excellent doctor, but also a wonderful educator.

He is knowledgeable about human affairs.

Choosing a leader for the new project is very important.

In medical classes, we learn about the structure of the human body.

It is important for each person to fulfill their role.

Yesterday, the President of the United States visited Japan as a state guest.

Hehe, that joke was funny, wasn't it?

He was mumbling something fuga fuga.