English verb conjugation
COULD COMPLEMENT

Regular verb: complement - complemented - complemented

Affirmation

Simple form	V-ing form
I could complement you could complement he could complement we could complement you could complement they could complement	I could be complementing you could be complementing he could be complementing we could be complementing you could be complementing they could be complementing
Perfect	V-ing perfect
I could have complemented you could have complemented he could have complemented we could have complemented you could have complemented they could have complemented	I could have been complementing you could have been complementing he could have been complementing we could have been complementing you could have been complementing they could have been complementing

Negation

Simple form	V-ing form
I couldn't complement you couldn't complement he couldn't complement we couldn't complement you couldn't complement they couldn't complement	I couldn't be complementing you couldn't be complementing he couldn't be complementing we couldn't be complementing you couldn't be complementing they couldn't be complementing
Perfect	V-ing perfect
I couldn't have complemented you couldn't have complemented he couldn't have complemented we couldn't have complemented you couldn't have complemented they couldn't have complemented	I couldn't have been complementing you couldn't have been complementing he couldn't have been complementing we couldn't have been complementing you couldn't have been complementing they couldn't have been complementing

Interrogative form

Simple form	V-ing form
could I complement? could you complement? could he complement? could we complement? could you complement? could they complement?	could I be complementing? could you be complementing? could he be complementing? could we be complementing? could you be complementing? could they be complementing?
Perfect	V-ing perfect
could I have complemented? could you have complemented? could he have complemented? could we have complemented? could you have complemented? could they have complemented?	could I have been complementing? could you have been complementing? could he have been complementing? could we have been complementing? could you have been complementing? could they have been complementing?

Interro-negative form

Simple form	V-ing form
couldn't I complement? couldn't you complement? couldn't he complement? couldn't we complement? couldn't you complement? couldn't they complement?	couldn't I be complementing? couldn't you be complementing? couldn't he be complementing? couldn't we be complementing? couldn't you be complementing? couldn't they be complementing?
Perfect	V-ing perfect
couldn't I have complemented? couldn't you have complemented? couldn't he have complemented? couldn't we have complemented? couldn't you have complemented? couldn't they have complemented?	couldn't I have been complementing? couldn't you have been complementing? couldn't he have been complementing? couldn't we have been complementing? couldn't you have been complementing? couldn't they have been complementing?