This volume gathers nine contributions dealing with Aorists and Perfects. Drinka challenges the notion of Aoristic Drift in Romance languages. Walker considers two emergent uses of the Perfect in British English. Jara seeks to determine the constraints on tense choice within narrative discourse in Peruvian Spanish. Henderson argues for a theory based on Langacker’s ‘sequential scanning’ in Chilean and Uruguayan Spanish. Delmas looks at ’Ua in Tahitian, a polysemic particle with a range of aspectual and modal meanings. Bourdin addresses the expression of anteriority with just in English. Yerastov examines the distribution of the transitive be Perfect in Canadian English. Fryd offers a panchronic study of have-less perfect constructions in English. Eide investigates counterfactual present perfects in Mainland Scandinavian dialects.