Examples include "pensar" ("to think"; e.g., "pienso" ["I think"]), "sentarse" ("to sit"; e.g., "me siento" ["I sit"]), "empezar" ("to begin"; e.g., "empiezo" ["I begin"]), "volver" ("to return"; e.g., "vuelvo" ["I return"]), and "acostarse" ("to go to bed"; e.g., "me acuesto" ["I go to bed"]).