Kazuo is my best friend.

Kazuto-kun is my best friend.

Kazuo is my best friend.

The children were having fun playing a counting game in the park.

The children were playing a counting game in the park.

A negative number refers to a number less than zero.

A positive number is a number greater than zero.

He had no choice but to fight empty-handed.

My father is a horse owner and owns several racehorses.

He is an excellent infielder, contributing greatly to the team's victory.