English verb conjugation
COULD INTERGRADE

Regular verb: intergrade - intergraded - intergraded

Affirmation

Simple form	V-ing form
I could intergrade you could intergrade he could intergrade we could intergrade you could intergrade they could intergrade	I could be intergrading you could be intergrading he could be intergrading we could be intergrading you could be intergrading they could be intergrading
Perfect	V-ing perfect
I could have intergraded you could have intergraded he could have intergraded we could have intergraded you could have intergraded they could have intergraded	I could have been intergrading you could have been intergrading he could have been intergrading we could have been intergrading you could have been intergrading they could have been intergrading

Negation

Simple form	V-ing form
I could not intergrade you could not intergrade he could not intergrade we could not intergrade you could not intergrade they could not intergrade	I could not be intergrading you could not be intergrading he could not be intergrading we could not be intergrading you could not be intergrading they could not be intergrading
Perfect	V-ing perfect
I could not have intergraded you could not have intergraded he could not have intergraded we could not have intergraded you could not have intergraded they could not have intergraded	I could not have been intergrading you could not have been intergrading he could not have been intergrading we could not have been intergrading you could not have been intergrading they could not have been intergrading

Interrogative form

Simple form	V-ing form
could I intergrade? could you intergrade? could he intergrade? could we intergrade? could you intergrade? could they intergrade?	could I be intergrading? could you be intergrading? could he be intergrading? could we be intergrading? could you be intergrading? could they be intergrading?
Perfect	V-ing perfect
could I have intergraded? could you have intergraded? could he have intergraded? could we have intergraded? could you have intergraded? could they have intergraded?	could I have been intergrading? could you have been intergrading? could he have been intergrading? could we have been intergrading? could you have been intergrading? could they have been intergrading?

Interro-negative form

Simple form	V-ing form
could I not intergrade? could you not intergrade? could he not intergrade? could we not intergrade? could you not intergrade? could they not intergrade?	could I not be intergrading? could you not be intergrading? could he not be intergrading? could we not be intergrading? could you not be intergrading? could they not be intergrading?
Perfect	V-ing perfect
could I not have intergraded? could you not have intergraded? could he not have intergraded? could we not have intergraded? could you not have intergraded? could they not have intergraded?	could I not have been intergrading? could you not have been intergrading? could he not have been intergrading? could we not have been intergrading? could you not have been intergrading? could they not have been intergrading?