What is an imperative sentence? What are the imperative sentences?

The function of imperative sentences is to ask, request or order others to do or not do something. \xd\ Imperative sentences usually end with exclamation marks, but some imperative sentences have a weak tone and can end with a period. \xd\ Imperative sentences can be finished with the modal particle "ba" or not. \xd\ imperative sentences can express orders, requests, prohibitions, discouragements, etc.