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QUICK ANSWER
"Diez" is a form of "diez", an adjective which is often translated as "ten". "Son las cuatro" is a phrase which is often translated as "it's four o'clock". Learn more about the difference between "son las cuatro" and "diez" below.
son las cuatro(
sohn
lahs
kwah
-
troh
)A phrase is a group of words commonly used together (e.g., once upon a time).
1. (general)
a. it's four o'clock
Son las cuatro de la tarde. Vamos a caminar al parque.It's four o'clock in the afternoon. Let's go for a walk in the park.
diez(
dyehs
)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)
a. ten
Ella lleva un diez en su camiseta en honor a su jugadora favorita.She wears a ten on her jersey in honor of her favorite player.
b. tenth (in dates)
Celebraremos mi cumpleaños el diez de enero.We'll celebrate my birthday on the tenth of January.
