English verb conjugation
COULD SUFFICE

Regular verb: suffice - sufficed - sufficed

Affirmation

Simple form	V-ing form
I could suffice you could suffice he could suffice we could suffice you could suffice they could suffice	I could be sufficing you could be sufficing he could be sufficing we could be sufficing you could be sufficing they could be sufficing
Perfect	V-ing perfect
I could have sufficed you could have sufficed he could have sufficed we could have sufficed you could have sufficed they could have sufficed	I could have been sufficing you could have been sufficing he could have been sufficing we could have been sufficing you could have been sufficing they could have been sufficing

Negation

Simple form	V-ing form
I couldn't suffice you couldn't suffice he couldn't suffice we couldn't suffice you couldn't suffice they couldn't suffice	I couldn't be sufficing you couldn't be sufficing he couldn't be sufficing we couldn't be sufficing you couldn't be sufficing they couldn't be sufficing
Perfect	V-ing perfect
I couldn't have sufficed you couldn't have sufficed he couldn't have sufficed we couldn't have sufficed you couldn't have sufficed they couldn't have sufficed	I couldn't have been sufficing you couldn't have been sufficing he couldn't have been sufficing we couldn't have been sufficing you couldn't have been sufficing they couldn't have been sufficing

Interrogative form

Simple form	V-ing form
could I suffice? could you suffice? could he suffice? could we suffice? could you suffice? could they suffice?	could I be sufficing? could you be sufficing? could he be sufficing? could we be sufficing? could you be sufficing? could they be sufficing?
Perfect	V-ing perfect
could I have sufficed? could you have sufficed? could he have sufficed? could we have sufficed? could you have sufficed? could they have sufficed?	could I have been sufficing? could you have been sufficing? could he have been sufficing? could we have been sufficing? could you have been sufficing? could they have been sufficing?

Interro-negative form

Simple form	V-ing form
couldn't I suffice? couldn't you suffice? couldn't he suffice? couldn't we suffice? couldn't you suffice? couldn't they suffice?	couldn't I be sufficing? couldn't you be sufficing? couldn't he be sufficing? couldn't we be sufficing? couldn't you be sufficing? couldn't they be sufficing?
Perfect	V-ing perfect
couldn't I have sufficed? couldn't you have sufficed? couldn't he have sufficed? couldn't we have sufficed? couldn't you have sufficed? couldn't they have sufficed?	couldn't I have been sufficing? couldn't you have been sufficing? couldn't he have been sufficing? couldn't we have been sufficing? couldn't you have been sufficing? couldn't they have been sufficing?