Quick answer
"Long ago" is an adverb which is often translated as "hace mucho tiempo", and "once" is an adverb which is often translated as "una vez". Learn more about the difference between "long ago" and "once" below.
long ago
An adverb is a word that describes a verb, an adjective, or other adverbs (e.g. to run quickly, very tired).
1. (general)
a. hace mucho tiempo
I met your mother long ago.Conocí a tu madre hace mucho tiempo.
b. hace mucho
Long ago, this area was farmland.Hace mucho, esta zona era tierra de cultivo.
c. tiempo atrás
Long ago, this school didn't even have electricity.Tiempo atrás, esta escuela ni siquiera tenía electricidad.
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once(
wuhns
)
An adverb is a word that describes a verb, an adjective, or other adverbs (e.g. to run quickly, very tired).
1. (on one occasion)
a. una vez
I go running only once a week.Salgo a correr solo una vez a la semana.
2. (formerly)
a. antes
I once knew how to play the piano, but I've forgotten almost everything.Antes sabía tocar el piano, pero lo he olvidado casi todo.
b. en otro tiempo
This church was once a mosque.Esta iglesia fue en otro tiempo una mezquita.
A conjunction is a word that connects words, phrases, clauses, or sentences (e.g. The cat and the dog slept.).
3. (when)
a. una vez que
He fell exhausted to the ground once he crossed the finish line.Cayó exhausto al suelo una vez que cruzó la meta.
b. una vez
Once outside I felt better.Una vez fuera me sentí mejor.
A noun is a word referring to a person, animal, place, thing, feeling or idea (e.g. man, dog, house).
4. (one occasion)
a.
This refers to an idiomatic word or phrase for which there is no word-for-word translation.
no direct translation
I decided to agree to it this once.Decidí permitirlo solo por esta vez.
I only saw him the once.Solo lo vi una vez.
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