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Questions & Answers about És daqui?
Why do we use és (from the verb ser) here instead of estás (from estar)?
Even though you are asking about a location, you are asking about someone's origin or where they are native to. In Portuguese, origin is considered a permanent characteristic, so we use ser rather than estar.
What words combine to make daqui?
daqui is a mandatory contraction of the preposition de (of/from) and the word aqui (here). When speaking at normal speed, these two words naturally blend together into one.
Why is there no word for "you" in this sentence?
Portuguese often drops subject pronouns like tu (you) because the verb form already tells us who is the subject. The word és can only ever apply to tu, so saying Tu és daqui? is unnecessary unless you want to add special emphasis.