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 cannot coif you cannot coif he cannot coif we cannot coif you cannot coif they cannot coif	I cannot be coifing you cannot be coifing he cannot be coifing we cannot be coifing you cannot be coifing they cannot be coifing
Perfect	V-ing perfect
I cannot have coifed you cannot have coifed he cannot have coifed we cannot have coifed you cannot have coifed they cannot have coifed	I cannot have been coifing you cannot have been coifing he cannot have been coifing we cannot have been coifing you cannot have been coifing they cannot 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 I not coif? can you not coif? can he not coif? can we not coif? can you not coif? can they not coif?	can I not be coifing? can you not be coifing? can he not be coifing? can we not be coifing? can you not be coifing? can they not be coifing?
Perfect	V-ing perfect
can I not have coifed? can you not have coifed? can he not have coifed? can we not have coifed? can you not have coifed? can they not have coifed?	can I not have been coifing? can you not have been coifing? can he not have been coifing? can we not have been coifing? can you not have been coifing? can they not have been coifing?