Hi George, I won’t be able to answer why it is like that. I can only answer how it works. Firstly, your sentence is in imperative mode, I mean that it is similar to an order. Secondly, it is a reflexive verb such as: S’arrêter S’habiller Se taire Se cacher Se rendre … In these conditions, sentences are built like the following positive-negative forms: Pos. : [Verb] [pronoun] ! Neg. : [Ne] [pronoun] [verb] [pas] ! Pos. : arrêtez-vous ! Neg. : Ne vous arrêtez pas ! Pos. : Habillez-vous ! Neg. : Ne vous habillez pas ! Pos. : Taisez-vous ! Neg. : Ne vous taisez pas ! Pos. : Cachez-vous ! Neg. : Ne vous cachez pas ! Pos. : Rendez-vous ! Neg. : Ne vous rendez pas Remark: Imperative mode is used for 2nd pers. sing / 1st pers. plur / 2nd pers. plur. I have written only examples for the 2nd pers. plur. However, it works for other persons as well.