I believe Inutil means "useless". No me diga means "Don't tell me".
Answer:
(Tú) (sujeto tacito)
(tú) cerraste bien la puerta?
Explanation:
El alumno escribía la respuesta pero no estudio.
El profesor es atlético
Nosotras somos extrovertidas
Sara es antipática
Los amigos son simpáticos
It would be "Sé Bueno" if thats what your looking for
Eres bueno = you are good
ser bueno = to be good
seas bueno , I really don't know but I it's not the answer
