Nunca/siempre and the preterite/imperfect
Could someone please explain to me whether "nunca" can take both the preterite and the imperfect? I've found other threads on the topic, but they are either unclear or contradict each other.
I've read that "nunca" refers to an unclear time period and therefore triggers use of the imperfect. I've also read that both the preterite and imperfect can be used, although I'm not sure how this changes the meaning.
Similarly, I've read that "siempre" refers to an unclear time period and should therefore take the imperfect, but I've also read that it can be used with the preterite.
Is there a clear answer on this? Or is it something about which there is some disagreement?
Thanks
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