Temps - Fréquence

in way that continues to happen all the time with no stop

ça arrive tout le temps

at any given hour, particularly a time that is late

en permanence

used for referring to a frequent change from something to another

d'un jour à l'autre

nearly all the time

la plupart du temps

in a way that is not continuous or regular

quelque chose qui arrive irrégulièrement

used for saying that something can only happen on very rare occasions

quelque chose qui arrive très rarement

used for referring to a very special opportunity that most likely will not be offered more than once to someone

quelque chose qui n'arrive qu'une seule fois

in a single action, without delay or hesitation

en un seul geste

in a manner that is consistent

toutes les heures de la semaine

on multiple occasions

à plusieurs reprises

used to describe something that happens at fixed intervals or follows a consistent pattern without fail

à temps