There is no stock answer for this question. It asks, "Are you a good student or bad?" The answer you give, of course, will depend on whether or not you care to disclose the truth about yourself, and if so, how much.
Quién eres is asking who are you. So, you would reply with who you are. Examples: Soy un estudiante. (I am a student.) Soy tu amigo. (I am your friend.)
Estoy bueno. Or, depending on context, soy bueno.
usted es demasiado bueno (I got this answer from altavista.com)I'd say 'Sos (o eres) un sol'. It's the closest equivalent to 'You're a doll', we wouldn't say 'usted es demasiado bueno', that's a literal translation
hmmm i no
you're an ass
You are good in school Eres bueno en la escuela You are a good student Eres un buen estudiante
Tu eres un buen estudiante.
Eres un niño malo
ni, ni
Eres un estudiante bien (replace 'un' for 'una' if it's a girl)
¿Tú eres ni estudiante o ni profesor?Are you a teacher or student or not?Answer:ni , ni
You say "Eres malo/a" if you are talking to a friend or "Usted es malo/a" if you are talking to a person that you are not well acquainted to. If the person you are talking to is a guy, you use "Malo". If the person you are talking to is a girl, you use "mala"
If you are a teacher, you could say this quite often, hopefully. "You are a very good student."
Es / eres formidable (singular formal/informal 'you are')Son / sois formidables (plural formal/informal 'you are').
plural form of un estudiante
In a formal situation (speaking to someone with whom you are mostly unfamiliar or not on a first name basis):Es un(a) estudiante.In an informal situation (speaking to someone with whom you are more familiar):Eres un(a) estudiante.
Are you still a student? = Toda vida eres un estudiante (toe-da) (vee-da) (er-es) (oon) (s-to-dee-ant-e)