Question

como responder a preguntas con el verbo to be
en negativo y afirmativo

Answer 1

afirmativo: is, are. Por ejemplo: she is beautiful
negativo: isn't, aren't. Por ejemplo: he isn't  available

Answer 2

Para I es: I am y I am not, o I'm y I'm not.
Para you, we, they: you are y you are not, o sea, you're y you aren't *se repite para we y they*
Para he, she e it: he is y he is not, o he's y he isn't