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"Los martes" is a form of "los martes", a phrase which is often translated as "Tuesdays". "Viernes" is a noun which is often translated as "Friday". Learn more about the difference between "viernes" and "los martes" below.
el viernes(
byehr
-
nehs
)A masculine noun is used with masculine articles and adjectives (e.g., el hombre guapo, el sol amarillo).
a. Friday
A partir de ahora, se puede llevar ropa informal en el trabajo los viernes.From now on you can wear casual clothes to work every Friday.
los martes
A phrase is a group of words commonly used together (e.g., once upon a time).
a. Tuesdays
¡Odio los martes! Tengo un horario horrible.I hate Tuesdays. I have a horrible schedule.
b. the Tuesdays
¿Por qué tienes esos días marcados en la agenda? - Esos son los martes que ensayamos.Why are those days marked in your diary? - Those are the Tuesdays we have rehearsals.
a. on Tuesdays
En el verano, siempre juego al tenis los martes después de clase.In the summer, I always play tennis after school on Tuesdays.
b. every Tuesday
Los martes tengo un profesor particular para ayudarme con las mates.I have a tutor every Tuesday to help me with math.
c. Tuesdays
¿Y los martes? ¿Estás libre para quedar por la tarde?What about Tuesdays? Are you free to meet in the afternoon?