The Present Perfect
Eso no es suficiente, ¿ ha comido usted una dieta equilibrada esta semana como yo le he dicho?
Why is it ha comido, and not has (tú) comido?
1 Answer
The sentence you provided "¿Ha comido usted una dieta equilibrada...?, is not written in the familiar "tu" format. "ha comida" is conjugated for the "usted" form used in the sentence.
Saludos/Cheers,
Moe