This study examines the identification processes of the semantics for progressive morphology by considering L2 English learners' production and processing together. The study found a strong link between production and processing for associating -ing with activity predicates in the higher proficiency group, which suggests that their identification of the semantics for -ing favors [±telic] predicates. This study discusses the role of the parser in the identification processes of aspectual -ing and emphasizes the role of aspectual transitions in the acquisition of aspect.