Normally, in Spanish, when addressing someone in a formal context the 3rd person singular and plural of the verb are used. Check whether these sentences are formales o informales:
¿De dónde eres? I
Where are you from?
¿Cómo se llama? F
What ‘s your name?
Buenos días, ¿cómo está? F
Good morning. How are you?
¿A qué te dedicas? I
What do you do?
¿Cuántos años tienes? I
How old are you?
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