Don't you understand Chinese?这是反问句,语气较为强烈。倘若只是想问的话,也可以用这个:Do you understand Chinese?好运~
Don't you understand Chinese?You don't understand Chinese,do you ?
法海你不懂爱,雷峰塔会倒下来。
You don't understand
Don't you understand Chinese?难道你不会中文?