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"El jueves" is a form of "jueves", a noun which is often translated as "Thursday". "El martes" is a form of "martes", a noun which is often translated as "Tuesday". Learn more about the difference between "el jueves" and "el martes" below.
el jueves(
hweh
-
behs
)A masculine noun is used with masculine articles and adjectives (e.g., el hombre guapo, el sol amarillo).
el martes(
mahr
-
tehs
)A masculine noun is used with masculine articles and adjectives (e.g., el hombre guapo, el sol amarillo).