In American English: anyone=anybody no one=nobody Common: Nobody should/can (ever) give anybody anything. (In America, we almost never use must)=giving people things is not allowed. Common: Nobody (ever) has to give anybody anything.=If you want to give somebody something, you can, but you are not compelled to do so. All of the following have the same meaning as the can/should sentence: Common: Everyone is forbidden to give anybody anything. Common: Everyone is forbidden to give people things. Common: No-one should ever give anyone anything. Common: People/you/we should never/not give anyone anything. Common: People/you/we should never/not give things to anyone else. OK but a bit strange: Everybody should never give anybody anything. Grammatically OK but NEVER used: everybody must give nobody anything. Wrong: Everybody never must give anybody anything; Anybody must not give anybody anything. ; Anybody must not give anybody anything.