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"Veinte" is an adjective which is often translated as "twenty", and "a las siete" is a phrase which is often translated as "at seven". Learn more about the difference between "veinte" and "a las siete" below.
veinte(
beyn
-
teh
)An adjective is a word that describes a noun (e.g., the big dog).
A masculine noun is used with masculine articles and adjectives (e.g., el hombre guapo, el sol amarillo).
2. (number)
b. twentieth (in dates)
El veinte del mes que viene me voy a España.I'm going to Spain on the twentieth of next month.
a las siete(
ah
lahs
syeh
-
teh
)A phrase is a group of words commonly used together (e.g., once upon a time).
a. at seven
¿Quieres que vayamos a tomar algo juntos después del trabajo? Yo salgo a las siete.Would you like to have a drink with me after work? I finish at seven.