English verb conjugation
COULD SUBVENE

Regular verb: subvene - subvened - subvened

Affirmation

Simple form	V-ing form
I could subvene you could subvene she could subvene we could subvene you could subvene they could subvene	I could be subvening you could be subvening she 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 she 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 she 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 couldn't subvene you couldn't subvene she couldn't subvene we couldn't subvene you couldn't subvene they couldn't subvene	I couldn't be subvening you couldn't be subvening she couldn't be subvening we couldn't be subvening you couldn't be subvening they couldn't be subvening
Perfect	V-ing perfect
I couldn't have subvened you couldn't have subvened she couldn't have subvened we couldn't have subvened you couldn't have subvened they couldn't have subvened	I couldn't have been subvening you couldn't have been subvening she couldn't have been subvening we couldn't have been subvening you couldn't have been subvening they couldn't have been subvening

Interrogative form

Simple form	V-ing form
could I subvene? could you subvene? could she subvene? could we subvene? could you subvene? could they subvene?	could I be subvening? could you be subvening? could she 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 she 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 she 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
couldn't I subvene? couldn't you subvene? couldn't she subvene? couldn't we subvene? couldn't you subvene? couldn't they subvene?	couldn't I be subvening? couldn't you be subvening? couldn't she be subvening? couldn't we be subvening? couldn't you be subvening? couldn't they be subvening?
Perfect	V-ing perfect
couldn't I have subvened? couldn't you have subvened? couldn't she have subvened? couldn't we have subvened? couldn't you have subvened? couldn't they have subvened?	couldn't I have been subvening? couldn't you have been subvening? couldn't she have been subvening? couldn't we have been subvening? couldn't you have been subvening? couldn't they have been subvening?