English verb conjugation
CAN COIF

Regular verb: coif - coifed - coifed

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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