Note 201 — EL CAPITÁN VENENO[4]
Reading edition
hago: this is as near as Spanish comes to our do as an auxiliary. Agradecer and sonreír are infinitives in apposition with the phrase lo que yo hago, what I do: say thank you and smile. Cf. ¿Qué hizo?—Lo mismo que su merced: reírse a todo trapo. What did he do?—The same as you: laugh with all his might. Alarcón, La Buenaventura, p. 4.