不能在教室吃东西用英文怎么说

"No eating in the classroom" 这个规则来自于学校或者教室的规章制度。

下面是一些相关的英文例句：

"Please refrain from eating in the classroom."
"Food is not allowed in the classroom."
"Eating is prohibited in the classroom."

对应的中文翻译：

"请不要在教室里吃东西。"
"教室里不允许吃东西。"
"在教室里吃东西是禁止的。"