My sister is 21?
My sister is 21. She goes to school presente simple negativo.
My sister is 21. She goes to school presente simple negativo.
En resumen
My sister is 21. She doesn´t to school.
My sister is 21.
She doesn´t to school.
My sister isnt 21.
She doesnt go to school.
Es afirmativa porque no lleva signo de interrogación y además esta afirmando y no lleva not.
Respuesta : Does she goes to school by bus? She doesn't go to school by bus.