could suffice
Regular verb: suffice - sufficed- sufficed

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