"A week" is a phrase which is often translated as "una semana", and "two" is an adjective which is often translated as "dos". Learn more about the difference between "a week" and "two" below.
a week
A phrase is a group of words commonly used together (e.g once upon a time).
1. (period of time)
a. una semana
After seeing a shooting star for the third time in a week, he figured his luck was bound to change.Tras ver una estrella fugaz por tercera vez en una semana, tuvo la certeza de que su suerte iba a cambiar.
2. (every week)
a. por semana
I go to the grocery store once a week.Voy al supermercado una vez por semana.
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An adjective is a word that describes a noun (e.g. the big dog).
1. (number)
a. dos
We live two blocks from the city center.Vivimos a dos cuadras del centro de la ciudad.
A noun is a word referring to a person, animal, place, thing, feeling or idea (e.g. man, dog, house).
2. (number)
a. el dos
(m) means that a noun is masculine. Spanish nouns have a gender, which is either feminine (like la mujer or la luna) or masculine (like el hombre or el sol).
The number that comes before three is two.El número que viene antes de tres es dos.
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