mind one's p's and q's

manage

control direct

act correctly act one's age act with decorum be civil be good be nice be on best behavior be orderly comport oneself conduct oneself properly demean oneself deport oneself discipline oneself keep one's nose clean keep the peace live up to manage oneself mind one's manners observe golden rule observe the law play fair shape up toe the mark watch one's step

act up misbehave

tend

trouble watch

be cautious be concerned be on guard be solicitous be wary have a care take care toe the line watch one's step watch out

disregard forget ignore neglect