English verb conjugation
COULD SUMMIT

Regular verb: summit - summited - summited

Affirmation

Simple form	V-ing form
I could summit you could summit he could summit we could summit you could summit they could summit	I could be summiting you could be summiting he could be summiting we could be summiting you could be summiting they could be summiting
Perfect	V-ing perfect
I could have summited you could have summited he could have summited we could have summited you could have summited they could have summited	I could have been summiting you could have been summiting he could have been summiting we could have been summiting you could have been summiting they could have been summiting

Negation

Simple form	V-ing form
I could not summit you could not summit he could not summit we could not summit you could not summit they could not summit	I could not be summiting you could not be summiting he could not be summiting we could not be summiting you could not be summiting they could not be summiting
Perfect	V-ing perfect
I could not have summited you could not have summited he could not have summited we could not have summited you could not have summited they could not have summited	I could not have been summiting you could not have been summiting he could not have been summiting we could not have been summiting you could not have been summiting they could not have been summiting

Interrogative form

Simple form	V-ing form
could I summit? could you summit? could he summit? could we summit? could you summit? could they summit?	could I be summiting? could you be summiting? could he be summiting? could we be summiting? could you be summiting? could they be summiting?
Perfect	V-ing perfect
could I have summited? could you have summited? could he have summited? could we have summited? could you have summited? could they have summited?	could I have been summiting? could you have been summiting? could he have been summiting? could we have been summiting? could you have been summiting? could they have been summiting?

Interro-negative form

Simple form	V-ing form
could I not summit? could you not summit? could he not summit? could we not summit? could you not summit? could they not summit?	could I not be summiting? could you not be summiting? could he not be summiting? could we not be summiting? could you not be summiting? could they not be summiting?
Perfect	V-ing perfect
could I not have summited? could you not have summited? could he not have summited? could we not have summited? could you not have summited? could they not have summited?	could I not have been summiting? could you not have been summiting? could he not have been summiting? could we not have been summiting? could you not have been summiting? could they not have been summiting?