English verb conjugation
COULD COIF

Regular verb: coif - coifed - coifed

Affirmation

Simple form	V-ing form
I could coif you could coif he could coif we could coif you could coif they could coif	I could be coifing you could be coifing he could be coifing we could be coifing you could be coifing they could be coifing
Perfect	V-ing perfect
I could have coifed you could have coifed he could have coifed we could have coifed you could have coifed they could have coifed	I could have been coifing you could have been coifing he could have been coifing we could have been coifing you could have been coifing they could have been coifing

Negation

Simple form	V-ing form
I couldn't coif you couldn't coif he couldn't coif we couldn't coif you couldn't coif they couldn't coif	I couldn't be coifing you couldn't be coifing he couldn't be coifing we couldn't be coifing you couldn't be coifing they couldn't be coifing
Perfect	V-ing perfect
I couldn't have coifed you couldn't have coifed he couldn't have coifed we couldn't have coifed you couldn't have coifed they couldn't have coifed	I couldn't have been coifing you couldn't have been coifing he couldn't have been coifing we couldn't have been coifing you couldn't have been coifing they couldn't have been coifing

Interrogative form

Simple form	V-ing form
could I coif? could you coif? could he coif? could we coif? could you coif? could they coif?	could I be coifing? could you be coifing? could he be coifing? could we be coifing? could you be coifing? could they be coifing?
Perfect	V-ing perfect
could I have coifed? could you have coifed? could he have coifed? could we have coifed? could you have coifed? could they have coifed?	could I have been coifing? could you have been coifing? could he have been coifing? could we have been coifing? could you have been coifing? could they have been coifing?

Interro-negative form

Simple form	V-ing form
couldn't I coif? couldn't you coif? couldn't he coif? couldn't we coif? couldn't you coif? couldn't they coif?	couldn't I be coifing? couldn't you be coifing? couldn't he be coifing? couldn't we be coifing? couldn't you be coifing? couldn't they be coifing?
Perfect	V-ing perfect
couldn't I have coifed? couldn't you have coifed? couldn't he have coifed? couldn't we have coifed? couldn't you have coifed? couldn't they have coifed?	couldn't I have been coifing? couldn't you have been coifing? couldn't he have been coifing? couldn't we have been coifing? couldn't you have been coifing? couldn't they have been coifing?