El auxiliar Do (y todas sus formas - Does, Don't, Did, Didin't) nunca, bajo ningún concepto, puede ser usado con el verbo To Be.
Recordemos que el verbo To Be significa ser o estar.
El presente se conjuga así:
I am
You are
He/She/It is
We are
You are
They are
El pasado es:
I was
You were
He/She/It was
We were
You were
They were
Atención, para preguntas tenemos que invertir el orden del pronombre y del verbo.
Ejemplo: Am I? / Was I? y así sucesivamente.
El auxiliar Do se usa para hacer preguntas o contestar preguntas hechas con el mismo, así como reafirmaciones. Se forma así en el presente:
Afirmativo Negativo
I do I don't (do not)
You do You don't
He/She/It does He/She/It doesn't (does not)
We do We don't
You do You don't
They do They don't
En el pasado tenemos:
Afirmativo Negativo
I did I didn't (did not)
You did You didn't
He/She/It did He/She/It didn't
We did We didn't
You did You didn't
They did They didn't
Ejemplos:
I don't like it. (Eso no me gusta).
I am not happy. (No estoy feliz).
Nunca puedes decir: I am don't happy.
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