In Spanish, you would say, ‘¿Has terminado?’ if you are addressing someone informally, or ‘¿Ha terminado?’ if you are speaking formally.
The phrase ‘¿Has terminado?’ comes from the verb ‘terminar’, which means ‘to finish’. ‘Has’ is the second-person singular form of the auxiliary verb ‘haber’, used here to indicate that you are inquiring about the completion of a task or activity. If you’re talking to someone in a more formal context, you would use ‘¿Ha terminado?’, which changes ‘has’ to ‘ha’, the third-person singular form of ‘haber’.
It’s important to choose the right form based on your relationship with the person you are speaking to, as Spanish often reflects levels of formality in its language structure.