ESTOY TRABAJANDO, coming from your point of view, “I’m working”
Answer: The answer is Son
Explanation: It is the masculine form of "they are" which when added to the sentence means "My brothers are very hardworking."
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<em>"De capullo en adelante una mariposa</em>
<em>Como dama desde su puerta</em>
<em>Surgió — una tarde de verano—</em>
<em>Reparando en todas partes ".</em>
(Emily Dickinson, "Del capullo, una mariposa")