English verb conjugation
COULD REFUEL

Regular verb: refuel - refuelled - refuelled

Affirmation

Simple form	V-ing form
I could refuel you could refuel he could refuel we could refuel you could refuel they could refuel	I could be refuelling you could be refuelling he could be refuelling we could be refuelling you could be refuelling they could be refuelling
Perfect	V-ing perfect
I could have refuelled you could have refuelled he could have refuelled we could have refuelled you could have refuelled they could have refuelled	I could have been refuelling you could have been refuelling he could have been refuelling we could have been refuelling you could have been refuelling they could have been refuelling

Negation

Simple form	V-ing form
I could not refuel you could not refuel he could not refuel we could not refuel you could not refuel they could not refuel	I could not be refuelling you could not be refuelling he could not be refuelling we could not be refuelling you could not be refuelling they could not be refuelling
Perfect	V-ing perfect
I could not have refuelled you could not have refuelled he could not have refuelled we could not have refuelled you could not have refuelled they could not have refuelled	I could not have been refuelling you could not have been refuelling he could not have been refuelling we could not have been refuelling you could not have been refuelling they could not have been refuelling

Interrogative form

Simple form	V-ing form
could I refuel? could you refuel? could he refuel? could we refuel? could you refuel? could they refuel?	could I be refuelling? could you be refuelling? could he be refuelling? could we be refuelling? could you be refuelling? could they be refuelling?
Perfect	V-ing perfect
could I have refuelled? could you have refuelled? could he have refuelled? could we have refuelled? could you have refuelled? could they have refuelled?	could I have been refuelling? could you have been refuelling? could he have been refuelling? could we have been refuelling? could you have been refuelling? could they have been refuelling?

Interro-negative form

Simple form	V-ing form
could I not refuel? could you not refuel? could he not refuel? could we not refuel? could you not refuel? could they not refuel?	could I not be refuelling? could you not be refuelling? could he not be refuelling? could we not be refuelling? could you not be refuelling? could they not be refuelling?
Perfect	V-ing perfect
could I not have refuelled? could you not have refuelled? could he not have refuelled? could we not have refuelled? could you not have refuelled? could they not have refuelled?	could I not have been refuelling? could you not have been refuelling? could he not have been refuelling? could we not have been refuelling? could you not have been refuelling? could they not have been refuelling?