Preterito vs. Imperfecto for Spanish Speakers!! Hola a los gentes que hablan espanol! I have been studying the Spanish grammar for quite sometime now, and I always have a problem of differentiating between when to use preterito or when to use imperfecto. I know imperfect is used for continuous actions, while preterito are used for actions that have definite endings. However, some sentences will have actions that will not have a definite ending stated to it, but still be conjugated as preterito. It would be nice if you can please give me advice on how you know whether to use either one. Muchas Gracias! Dios les bendiga!