could doff
Regular verb: doff - doffed- doffed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could doff
you could doff
she could doff
we could doff
you could doff
they could doff 	I could be doffing
you could be doffing
she could be doffing
we could be doffing
you could be doffing
they could be doffing	I could have doffed
you could have doffed
she could have doffed
we could have doffed
you could have doffed
they could have doffed	I could have been doffing
you could have been doffing
she could have been doffing
we could have been doffing
you could have been doffing
they could have been doffing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not doff
you could not doff
she could not doff
we could not doff
you could not doff
they could not doff 	I could not be doffing
you could not be doffing
she could not be doffing
we could not be doffing
you could not be doffing
they could not be doffing	I could not have doffed
you could not have doffed
she could not have doffed
we could not have doffed
you could not have doffed
they could not have doffed	I could not have been doffing
you could not have been doffing
she could not have been doffing
we could not have been doffing
you could not have been doffing
they could not have been doffing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I doff?
could you doff?
could she doff?
could we doff?
could you doff?
could they doff? 	could I be doffing?
could you be doffing?
could she be doffing?
could we be doffing?
could you be doffing?
could they be doffing? 	could I have doffed?
could you have doffed?
could she have doffed?
could we have doffed?
could you have doffed?
could they have doffed? 	could I have been doffing?
could you have been doffing?
could she have been doffing?
could we have been doffing?
could you have been doffing?
could they have been doffing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not doff?
could you not doff?
could she not doff?
could we not doff?
could you not doff?
could they not doff? 	could I not be doffing?
could you not be doffing?
could she not be doffing?
could we not be doffing?
could you not be doffing?
could they not be doffing? 	could I not have doffed?
could you not have doffed?
could she not have doffed?
could we not have doffed?
could you not have doffed?
could they not have doffed? 	could I not have been doffing?
could you not have been doffing?
could she not have been doffing?
could we not have been doffing?
could you not have been doffing?
could they not have been doffing?