These Spanish classes provide basic vocabulary related to universities that helps you to discuss campus life and different career paths. We review the use of the present perfect tense and explain how to use ‘desde’, ‘por’ and ‘durante’ in this tense. We also demonstrate how to use modal periphrases to describe obligations and show you how to form perfect modals by combining modal verbs with the verb 'haber’ (‘to have’). Sign up to learn Spanish.