Gramatical Structure / Estructura Gramatical
(example with verb to go)

Afirmative clause / Frase afirmativa

Sujeto + to be + about to + verbo principal --> I am about to go (Estoy apunto de salir)

Negative clause / Frase negativa

Sujeto + to be + not + about to + verbo principal --> I am not about to go (No estoy apunto de salir)

Interrogative clause/ Frase interrogativa

To be + sujeto + about to + verbo principal? --> Are you about to go? (¿Estás a punto de salir?)