This chapter tackles two important aspects of the association of French motion verbs and spatial PPs. The main notions used in order to characterize strict motion predicates are first recalled. The possibility, for the verbs, of appearing in constructions that do not express the landmark entity of the motion event (implicit landmark constructions), is studied and it is argued to depend on the spatio-temporal structure of the verbs and on various other factors. Then, the association of verbs and PPs with opposite polarities is examined which turns out to be in close correlation with the existence of an "implicit use". The conclusion emphasizes the asymmetries/dissymmetries between initial and final motion events revealed by the constructions studied.