Correção Gramatical: 'Does Your Brother Work in a Hospital?'

A frase "Do your brother work in a hospital?" é gramaticalmente incorreta.

Forma Correta

"Does your brother work in a hospital?"

Pronome do Sujeito	Verbo Auxiliar (Presente)
I, You, We, They	do
He, She, It (substantivos singulares)	does

"Your brother" = terceira pessoa do singular (equivalente a "he") → requer does.
"Do" é usado apenas com sujeitos plurais ou I/you/we/they.

✅ Does he work? / Does she work? / Does it work? / Does your brother work?
✅ Do I work? / Do you work? / Do we work? / Do they work? / Do your brothers work?
❌ Do he work? / Do she work? / Do your brother work?

Em perguntas com auxiliar "do/does", o verbo principal ("work") permanece na forma base. O auxiliar carrega o tempo e a concordância.