English verb conjugation
COULD SUBVENE

Regular verb: subvene - subvened - subvened

Affirmation

Simple form	V-ing form
I could subvene you could subvene he could subvene we could subvene you could subvene they could subvene	I could be subvening you could be subvening he could be subvening we could be subvening you could be subvening they could be subvening
Perfect	V-ing perfect
I could have subvened you could have subvened he could have subvened we could have subvened you could have subvened they could have subvened	I could have been subvening you could have been subvening he could have been subvening we could have been subvening you could have been subvening they could have been subvening

Negation

Simple form	V-ing form
I could not subvene you could not subvene he could not subvene we could not subvene you could not subvene they could not subvene	I could not be subvening you could not be subvening he could not be subvening we could not be subvening you could not be subvening they could not be subvening
Perfect	V-ing perfect
I could not have subvened you could not have subvened he could not have subvened we could not have subvened you could not have subvened they could not have subvened	I could not have been subvening you could not have been subvening he could not have been subvening we could not have been subvening you could not have been subvening they could not have been subvening

Interrogative form

Simple form	V-ing form
could I subvene? could you subvene? could he subvene? could we subvene? could you subvene? could they subvene?	could I be subvening? could you be subvening? could he be subvening? could we be subvening? could you be subvening? could they be subvening?
Perfect	V-ing perfect
could I have subvened? could you have subvened? could he have subvened? could we have subvened? could you have subvened? could they have subvened?	could I have been subvening? could you have been subvening? could he have been subvening? could we have been subvening? could you have been subvening? could they have been subvening?

Interro-negative form

Simple form	V-ing form
could I not subvene? could you not subvene? could he not subvene? could we not subvene? could you not subvene? could they not subvene?	could I not be subvening? could you not be subvening? could he not be subvening? could we not be subvening? could you not be subvening? could they not be subvening?
Perfect	V-ing perfect
could I not have subvened? could you not have subvened? could he not have subvened? could we not have subvened? could you not have subvened? could they not have subvened?	could I not have been subvening? could you not have been subvening? could he not have been subvening? could we not have been subvening? could you not have been subvening? could they not have been subvening?