“不要在教室里乱打闹” 用英语说

" don't make a fun in the classroom arbitrarily "

Don't quarrel and fight noisily in the classroom.

Do not quarrel in the classroom!
其实这些你查一下字典不就行了?何必浪费时间了!
你可知道时间对于我们来说是多么宝贵的啊!

Don't beat to make in the classroom.