English verb conjugation
COULD PERTAIN

Regular verb: pertain - pertained - pertained

Affirmation

Simple form	V-ing form
I could pertain you could pertain he could pertain we could pertain you could pertain they could pertain	I could be pertaining you could be pertaining he could be pertaining we could be pertaining you could be pertaining they could be pertaining
Perfect	V-ing perfect
I could have pertained you could have pertained he could have pertained we could have pertained you could have pertained they could have pertained	I could have been pertaining you could have been pertaining he could have been pertaining we could have been pertaining you could have been pertaining they could have been pertaining

Negation

Simple form	V-ing form
I could not pertain you could not pertain he could not pertain we could not pertain you could not pertain they could not pertain	I could not be pertaining you could not be pertaining he could not be pertaining we could not be pertaining you could not be pertaining they could not be pertaining
Perfect	V-ing perfect
I could not have pertained you could not have pertained he could not have pertained we could not have pertained you could not have pertained they could not have pertained	I could not have been pertaining you could not have been pertaining he could not have been pertaining we could not have been pertaining you could not have been pertaining they could not have been pertaining

Interrogative form

Simple form	V-ing form
could I pertain? could you pertain? could he pertain? could we pertain? could you pertain? could they pertain?	could I be pertaining? could you be pertaining? could he be pertaining? could we be pertaining? could you be pertaining? could they be pertaining?
Perfect	V-ing perfect
could I have pertained? could you have pertained? could he have pertained? could we have pertained? could you have pertained? could they have pertained?	could I have been pertaining? could you have been pertaining? could he have been pertaining? could we have been pertaining? could you have been pertaining? could they have been pertaining?

Interro-negative form

Simple form	V-ing form
could I not pertain? could you not pertain? could he not pertain? could we not pertain? could you not pertain? could they not pertain?	could I not be pertaining? could you not be pertaining? could he not be pertaining? could we not be pertaining? could you not be pertaining? could they not be pertaining?
Perfect	V-ing perfect
could I not have pertained? could you not have pertained? could he not have pertained? could we not have pertained? could you not have pertained? could they not have pertained?	could I not have been pertaining? could you not have been pertaining? could he not have been pertaining? could we not have been pertaining? could you not have been pertaining? could they not have been pertaining?