That jackass made the same mistake again.

You really are an idiot.

He is an expert in ethology, and his research is highly regarded worldwide.

Do you know the proverb 'A fool who prunes cherry trees, a fool who does not prune plum trees'?

He likes to take a walk in the park at dusk.

On April Fools' Day, it's fun to tell jokes and surprise your friends.

Mr. Koshu is my best friend.

He has a habit of drinking a small amount of alcohol every night.

Mr. Koshu is my best friend.

The small fish are swimming in the river.