Teach your child to ask before taking. Let him know that it is not respectful to take someone’s things without first asking and if he does, he should apologize and then ask for permission.
教導孩子徵詢同伴的意見,不是自己的東西未經他人許可,不可以擅自拿取,如「你沒有經過凱凱的同意就拿他的玩具,這樣是不尊重凱凱,去跟他說對不起,然後再請他把玩具借你玩」。