He is suffering from lovesickness.

He fell deeply in love with her and became lovesick.

He chose to self-determine his own life.

I want to go to the national art museum.

He has studied abroad in Russia.

Brazil is known as one of the emerging countries.

He felt labored breathing and immediately contacted a doctor.

The teacher wrote the problem on the blackboard.

He is late every day.

Koizumi-san is my best friend.