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Questions & Answers about ¿Estás enfermo hoy?
Why do we use estás here instead of eres?
Where is the word for "you" in this sentence?
In Spanish, the verb ending usually tells us who the subject is. The verb form estás specifically means "you are" (informal, singular). You don't need to include the pronoun tú, though you could say ¿Tú estás enfermo hoy? for emphasis.
What if I am asking a female friend if she is sick?
Why doesn't the word order change to make it a question, like "Are you" instead of "You are"?