could sheaf
Regular verb: sheaf - sheafed- sheafed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could sheaf
you could sheaf
she could sheaf
we could sheaf
you could sheaf
they could sheaf 	I could be sheafing
you could be sheafing
she could be sheafing
we could be sheafing
you could be sheafing
they could be sheafing	I could have sheafed
you could have sheafed
she could have sheafed
we could have sheafed
you could have sheafed
they could have sheafed	I could have been sheafing
you could have been sheafing
she could have been sheafing
we could have been sheafing
you could have been sheafing
they could have been sheafing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not sheaf
you could not sheaf
she could not sheaf
we could not sheaf
you could not sheaf
they could not sheaf 	I could not be sheafing
you could not be sheafing
she could not be sheafing
we could not be sheafing
you could not be sheafing
they could not be sheafing	I could not have sheafed
you could not have sheafed
she could not have sheafed
we could not have sheafed
you could not have sheafed
they could not have sheafed	I could not have been sheafing
you could not have been sheafing
she could not have been sheafing
we could not have been sheafing
you could not have been sheafing
they could not have been sheafing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I sheaf?
could you sheaf?
could she sheaf?
could we sheaf?
could you sheaf?
could they sheaf? 	could I be sheafing?
could you be sheafing?
could she be sheafing?
could we be sheafing?
could you be sheafing?
could they be sheafing? 	could I have sheafed?
could you have sheafed?
could she have sheafed?
could we have sheafed?
could you have sheafed?
could they have sheafed? 	could I have been sheafing?
could you have been sheafing?
could she have been sheafing?
could we have been sheafing?
could you have been sheafing?
could they have been sheafing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not sheaf?
could you not sheaf?
could she not sheaf?
could we not sheaf?
could you not sheaf?
could they not sheaf? 	could I not be sheafing?
could you not be sheafing?
could she not be sheafing?
could we not be sheafing?
could you not be sheafing?
could they not be sheafing? 	could I not have sheafed?
could you not have sheafed?
could she not have sheafed?
could we not have sheafed?
could you not have sheafed?
could they not have sheafed? 	could I not have been sheafing?
could you not have been sheafing?
could she not have been sheafing?
could we not have been sheafing?
could you not have been sheafing?
could they not have been sheafing?