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Los lunes siempre estoy cansado.

Los lunes siempre estoy cansado.
On Mondays I am always tired.
From Lesson 44:Days of the week (el lunes, el martes)·Spanish (Spain)

Questions & Answers about Los lunes siempre estoy cansado.

Why does the sentence use los lunes instead of translating the word 'on'?
In Spanish, you don't use a preposition like 'on' for days of the week. Instead, you just use the definite article. Use el for a single occurrence (like el lunes for 'on Monday') and los for a repeated day (like los lunes for 'on Mondays').
Does the word lunes change when it becomes plural?
No, it stays exactly the same! Days of the week that already end in an 's' (Monday through Friday) do not change their spelling in the plural. The only thing that changes is the article, which goes from el to los.
Why use estoy instead of soy for 'I am'?
You use estoy (from the verb estar) because being tired is a temporary physical state or feeling. You use ser (like soy) for permanent traits, so saying soy cansado would sound very strange, like being a tired person is your permanent identity.
Would this sentence change if a woman were speaking?
Yes! Because adjectives have to match the gender of the person they describe, a female speaker would change the ending of the adjective and say Los lunes siempre estoy cansada.

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