The study concerns a statement such as Quand on vous dit que (les prix baissent); it is shown that quand is fixed, and on vous dit que semi-fixed, quand taking the function of an alethic modalizer, which matches the time of the enunciation with the time of the reported event. This expression illustrates the theory of grammaticalization in two ways, by the evolution of the status of quand on the one hand, and by the autonomous, parataxic status of the locution on the other hand. We can speak of a new example of insubordination.