could coif
Regular verb: coif - coifed- coifed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
I could not coif
you could not coif
he could not coif
we could not coif
you could not coif
they could not coif 	I could not be coifing
you could not be coifing
he could not be coifing
we could not be coifing
you could not be coifing
they could not be coifing	I could not have coifed
you could not have coifed
he could not have coifed
we could not have coifed
you could not have coifed
they could not have coifed	I could not have been coifing
you could not have been coifing
he could not have been coifing
we could not have been coifing
you could not have been coifing
they could not have been coifing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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? 	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 	Perfect 	V-ing perfect 	
could I not coif?
could you not coif?
could he not coif?
could we not coif?
could you not coif?
could they not coif? 	could I not be coifing?
could you not be coifing?
could he not be coifing?
could we not be coifing?
could you not be coifing?
could they not be coifing? 	could I not have coifed?
could you not have coifed?
could he not have coifed?
could we not have coifed?
could you not have coifed?
could they not have coifed? 	could I not have been coifing?
could you not have been coifing?
could he not have been coifing?
could we not have been coifing?
could you not have been coifing?
could they not have been coifing?