This study focuses on the use of modes that are dependent on impersonal structures found in the French spoken in Quebec. Six impersonal structures are identified as causing modal variation in the subordinate. This variation is constrained mainly by linguistic factors. Social factors also influence the variation, but the amount of influence exerted varies according to the impersonal structure analyzed. Minimal difference is found in the use of modes between French and Quebecois. Conclusions are based on a main corpus of data and personal observations. (SR)