Be on (one's) good behavior American verb phrase
Behave in a way that show respect and politeness
This is the first time I have met her parents, so I should be on my good behavior.
The kids promised to be on their good behavior for the new housemaid.
people often do irrational or foolish things when they are in love.
Used to describe someone kind, calm and pleasant
To stay out of trouble or avoid doing something wrong
Used when you threaten to harm someone in the same way as they harmed you
The verb "be" should be conjugated according to its tense.
This phrase is used to describe something very modern or updated or something that no longer looks like what it's used to.
It has been a long time since I left my high school, and now I have to admit that it's certainly not your father's high school anymore.