could fuel
Regular verb: fuel - fuelled- fuelled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could fuel
you could fuel
she could fuel
we could fuel
you could fuel
they could fuel 	I could be fuelling
you could be fuelling
she could be fuelling
we could be fuelling
you could be fuelling
they could be fuelling	I could have fuelled
you could have fuelled
she could have fuelled
we could have fuelled
you could have fuelled
they could have fuelled	I could have been fuelling
you could have been fuelling
she could have been fuelling
we could have been fuelling
you could have been fuelling
they could have been fuelling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not fuel
you could not fuel
she could not fuel
we could not fuel
you could not fuel
they could not fuel 	I could not be fuelling
you could not be fuelling
she could not be fuelling
we could not be fuelling
you could not be fuelling
they could not be fuelling	I could not have fuelled
you could not have fuelled
she could not have fuelled
we could not have fuelled
you could not have fuelled
they could not have fuelled	I could not have been fuelling
you could not have been fuelling
she could not have been fuelling
we could not have been fuelling
you could not have been fuelling
they could not have been fuelling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I fuel?
could you fuel?
could she fuel?
could we fuel?
could you fuel?
could they fuel? 	could I be fuelling?
could you be fuelling?
could she be fuelling?
could we be fuelling?
could you be fuelling?
could they be fuelling? 	could I have fuelled?
could you have fuelled?
could she have fuelled?
could we have fuelled?
could you have fuelled?
could they have fuelled? 	could I have been fuelling?
could you have been fuelling?
could she have been fuelling?
could we have been fuelling?
could you have been fuelling?
could they have been fuelling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not fuel?
could you not fuel?
could she not fuel?
could we not fuel?
could you not fuel?
could they not fuel? 	could I not be fuelling?
could you not be fuelling?
could she not be fuelling?
could we not be fuelling?
could you not be fuelling?
could they not be fuelling? 	could I not have fuelled?
could you not have fuelled?
could she not have fuelled?
could we not have fuelled?
could you not have fuelled?
could they not have fuelled? 	could I not have been fuelling?
could you not have been fuelling?
could she not have been fuelling?
could we not have been fuelling?
could you not have been fuelling?
could they not have been fuelling?