Ken-go is my best friend.

It is important to learn about the prevention and treatment of the human immunodeficiency virus.

The lens of this camera is easy to attach and remove.

My grandfather has traveled the world when he was young.

He played his trump card at the end of the argument.

This antique clock is something I inherited from my grandfather.

He is good at deciphering new music scores.

I always play golf with my friends on weekends.

He is good at writing and writes a diary every day.

He is a good correspondent, always writing letters.