Os Verbos Ir, Dever E Poder E Seus Infinitivos: Sintaxe Interna E Externa The Verbs Ir (‘go’), Dever (‘must’) and Poder (‘can may’) and Their Infinitives: Internal and External Syntax. Rev. Est. Ling. 2019, 27 (2), 935-966. https://doi.org/10.17851/2237-2083.27.2.935-966.