advertir, comprobar, confirmar, confrontar, constatar, cotejar, ensayar, estudiar, examinar, experimentar, intentar, observar, probar, tantear
comprobar, compulsar, confirmar, corroborar, demostrar, probar, repasar, revisar
efectuar, realizar
comprobar, correr detrás, estar tras, investigar
comprobar, controlar
comprobar, constatar, controlar, examinar, investigar