Everyone must keep the rules.

人人必需笃守规章制度。

Everyone must keep the rules.

人人必须遵守规章制度。

Keep the rules for the public.

遵守公共场所规则。

To be good students, we should keep the rules of our school.

要成为好学生，我们应该遵守学校的规章制度。

He will always "play fair" and honorably keep the rules of the game.

他总是会“公平地比赛”，与诚实地遵守比赛规则。