Let's take the kids to the fair.
It's not fair! He always gets more than me.
Sometimes I feel that this world is really not fair!
I don't think it's fair to punish me for a mistake I made years ago.
punish [ˈpʌnɪʃ] 处罚;惩罚
mistake [mɪˈsteɪk] 错误，失误