"No, you may not have the car's keys." "No, you may not sleep in my bed tonight." (You may sleep on the couch i.f.o. the TV.) "No, you may not eat from my table for the next week." "No, you may not know who is my new secretary." "No, I am not going to look after your brats." "No, I do not want to be married to you any longer."
Don't ask me to explain myself; "No." is a full sentence.