could cancel
Regular verb: cancel - cancelled- cancelled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could cancel
you could cancel
she could cancel
we could cancel
you could cancel
they could cancel 	I could be cancelling
you could be cancelling
she could be cancelling
we could be cancelling
you could be cancelling
they could be cancelling	I could have cancelled
you could have cancelled
she could have cancelled
we could have cancelled
you could have cancelled
they could have cancelled	I could have been cancelling
you could have been cancelling
she could have been cancelling
we could have been cancelling
you could have been cancelling
they could have been cancelling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not cancel
you could not cancel
she could not cancel
we could not cancel
you could not cancel
they could not cancel 	I could not be cancelling
you could not be cancelling
she could not be cancelling
we could not be cancelling
you could not be cancelling
they could not be cancelling	I could not have cancelled
you could not have cancelled
she could not have cancelled
we could not have cancelled
you could not have cancelled
they could not have cancelled	I could not have been cancelling
you could not have been cancelling
she could not have been cancelling
we could not have been cancelling
you could not have been cancelling
they could not have been cancelling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I cancel?
could you cancel?
could she cancel?
could we cancel?
could you cancel?
could they cancel? 	could I be cancelling?
could you be cancelling?
could she be cancelling?
could we be cancelling?
could you be cancelling?
could they be cancelling? 	could I have cancelled?
could you have cancelled?
could she have cancelled?
could we have cancelled?
could you have cancelled?
could they have cancelled? 	could I have been cancelling?
could you have been cancelling?
could she have been cancelling?
could we have been cancelling?
could you have been cancelling?
could they have been cancelling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not cancel?
could you not cancel?
could she not cancel?
could we not cancel?
could you not cancel?
could they not cancel? 	could I not be cancelling?
could you not be cancelling?
could she not be cancelling?
could we not be cancelling?
could you not be cancelling?
could they not be cancelling? 	could I not have cancelled?
could you not have cancelled?
could she not have cancelled?
could we not have cancelled?
could you not have cancelled?
could they not have cancelled? 	could I not have been cancelling?
could you not have been cancelling?
could she not have been cancelling?
could we not have been cancelling?
could you not have been cancelling?
could they not have been cancelling?