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Motion verbs and their Source role. In this study on puzzling properties of the en clitic when binding Spatial positions, a Source and a PP positions for motion predicates are defined. At first, a thematic analysis is presented, and then rejected. A categorical descriptional distinguishing ADV and PP positions is then proposed, but it shows up as bearing a major flaw for not being able to take into account { sortir} predicates. The solution given incorporates the argument-structure component : the { descendre} and the { monter}sets are in argument and adjunct positions. The goal of this paper is to trace an analogy betwenn event quantification operated by verbal inflections (such as imparfait or passé composé) and object quantification operated by nominal quantifiers. The key notion used for this purpose is that of homogeneous reference. We show here that quantification operated by homogeneous inflections and nominal quantifiers can be characterized as partitive, analytic and non-bounded whereas quantification operated by heterogeneous inflections and nominal quantifiers is non-partitive, synthetic and bounded.