Quick answer
"Once" is an adverb which is often translated as "una vez", and "twice a week" is a phrase which is often translated as "dos veces por semana". Learn more about the difference between "once" and "twice a week" below.
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)
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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twice a week(
A phrase is a group of words commonly used together (e.g once upon a time).
1. (general)
a. dos veces por semana
I call my mom twice a week so she knows how I am.Llamo a mi mamá dos veces por semana para que sepa cómo estoy.
b. dos veces a la semana
We get together twice a week for lunch.Nos juntamos dos veces a la semana para almorzar.
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