advertir, confirmar, confrontar, constatar, cotejar, ensayar, estudiar, examinar, experimentar, intentar, observar, probar, tantear, verificar
advertir, apreciar, distinguir, notar, observar, percatar, percibir, reparar, sentir, ver
asegurarse, cerciorarse
compulsar, confirmar, corroborar, demostrar, probar, repasar, revisar, verificar
repasar, revisar
revisar
correr detrás, estar tras, investigar, verificar
controlar, verificar
constatar, controlar, examinar, investigar, verificar
inspeccionar