He cautioned not to speak ill of others, saying, 'Illness enters by the mouth, and disaster does not come out of it.'

He is always joking around during class.

He was singing to himself alone in the room.

He was playing alone in the park.

That movie was tremendously moving.

Digital terrestrial television broadcasting has good picture quality and high sound quality.

I often quarrel with him.

He was walking while whistling.

He is good at playing the harmonica.