Cierto o falso: Al hablar del imperfecto, ¿se puede usar las palabras un día, una tarde y de repente? Question 3 options:
True
False

True

Explanation:

because It only expresses that an event was in the past.  It does not contain any limits.  We pretend we don't know when it started or when it ended.

True: un día, una tarde ; False: de repente

Explanation:

The imperfect can be used to describe events that were happening in the past over time, so we can say:

Un día yo estaba en la playa cuando...  (imperfect past)

Una tarde nosotros íbamos al parque y...  (imperfect past)

On the other hand, if we want to talk about a specific event that happened in the past, we use the preterit tense.

de repente empezó a llover.   (preterite)

de repente vimos a nuestros vecinos. (preterite)

One day I was at the beach when suddenly it started to rain.  

One afternoon we were going to the park and suddenly we saw our neighbors.

google translate is the way to go, sorry i cant you but its a trusted resource to use