The command form in Vietnamese uses multiple words: You use “…đi!” when ordering or commanding in an aggressive way.  You use “…nào!” when ordering or commanding in an encouraging way Không được means to not be allowed to do something. You use “Đừng…” when you want to command someone not to do something. You use “Xin hãy…” when you want to ask for help or favour (please) but in a very desperate way. -- Check out sentence examples in our lesson about the Vietnamese command form.