QUICK ANSWER
"Una vez" is a phrase which is often translated as "once", and "alguna vez" is a phrase which is often translated as "ever". Learn more about the difference between "una vez" and "alguna vez" below.
una vez(
oo
-
nah
behs
)A phrase is a group of words commonly used together (e.g., once upon a time).
alguna vez(
ahl
-
goo
-
nah
behs
)A phrase is a group of words commonly used together (e.g., once upon a time).
1. (general)
b. sometime (used with future contexts)
Alguna vez debemos ir a desayunar en ese restaurante.We should have breakfast at that restaurant sometime.
c. once (used with past contexts)
Alguna vez pensé que llegaría a ser presidente de este país.I once thought I would get to be president of this country.