Cách sử dụng
The expression "be on your best behaviour" is used to encourage someone to behave well and be polite in a specific situation. It is often used when someone is going to a formal occasion, meeting someone important, or visiting a new place. For example, if your friend invites you to a family gathering, they may tell you to "be on your best behaviour" so that you make a good impression on their family members. It is a way of reminding someone to act appropriately and respectfully.