Mr. Kasuya is my best friend.

He inflicted heavy damage on the enemy.

He prepared a special costume for Halloween.

He studies classical literature and repeats old words.

He lives in a remote place.

He overestimated his own abilities.

He was overestimating his own abilities.

This room is dry, so I will humidify it using a humidifier.

The room is dry, so let's humidify it using a humidifier.

Tsutomu vowed eternal love.