In this paper, our aim is to analyze the relationship between the development of verbal forms and verbal functions. We examine all verbal forms produced longitudinally by two French children in terms of their morphosyntactic marking of tense, aspect, mood and situation type, and compare them to their contextually interpreted meanings. We introduce the main issues relevant to the unfolding of the verbal temporal system in children's data. Our data consists in two longitudinal corpora of French speaking children aged 1;06 to 3;01. The paper focuses on: 1) the relationship between form and function within the verbal system in the earlier stage of development; 2) the children's ability to mark a displacement between speech time and event time.