asa - adv de mod, CCM, caz Ac
s-a intamplat= verb predicativ, personal, diateza reflex, mod indicativ, timp perfect compus, PV
cand= adverb interogativ CCT, caz Ac
cel= articol demonstrativ, fara functie sintactica
de = prepozitie cu cazul acuzativ; fara functie sintactica
sau= adjectiv pronumonal posesiv, AT adj posesiv, caz AC