could fuel
Regular verb: fuel - fuelled- fuelled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could fuel
you could fuel
he could fuel
we could fuel
you could fuel
they could fuel 	I could be fuelling
you could be fuelling
he could be fuelling
we could be fuelling
you could be fuelling
they could be fuelling	I could have fuelled
you could have fuelled
he 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
he 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 couldn't fuel
you couldn't fuel
he couldn't fuel
we couldn't fuel
you couldn't fuel
they couldn't fuel 	I couldn't be fuelling
you couldn't be fuelling
he couldn't be fuelling
we couldn't be fuelling
you couldn't be fuelling
they couldn't be fuelling	I couldn't have fuelled
you couldn't have fuelled
he couldn't have fuelled
we couldn't have fuelled
you couldn't have fuelled
they couldn't have fuelled	I couldn't have been fuelling
you couldn't have been fuelling
he couldn't have been fuelling
we couldn't have been fuelling
you couldn't have been fuelling
they couldn't have been fuelling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I fuel?
could you fuel?
could he fuel?
could we fuel?
could you fuel?
could they fuel? 	could I be fuelling?
could you be fuelling?
could he be fuelling?
could we be fuelling?
could you be fuelling?
could they be fuelling? 	could I have fuelled?
could you have fuelled?
could he 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 he 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 	
couldn't I fuel?
couldn't you fuel?
couldn't he fuel?
couldn't we fuel?
couldn't you fuel?
couldn't they fuel? 	couldn't I be fuelling?
couldn't you be fuelling?
couldn't he be fuelling?
couldn't we be fuelling?
couldn't you be fuelling?
couldn't they be fuelling? 	couldn't I have fuelled?
couldn't you have fuelled?
couldn't he have fuelled?
couldn't we have fuelled?
couldn't you have fuelled?
couldn't they have fuelled? 	couldn't I have been fuelling?
couldn't you have been fuelling?
couldn't he have been fuelling?
couldn't we have been fuelling?
couldn't you have been fuelling?
couldn't they have been fuelling?