Why did you bully him everyday? You've gone too far.
你为什么每天欺负他？你太过分了。
Why do you pick on your brother?
你为什么作弄你的弟弟？
He is all talk but no action.
他只有空谈没有行动。
He is very cheap.
他很小气。
He is generous.
他大方。