I could refuel you could refuel she could refuel we could refuel you could refuel they could refuel
Forma con V-ing
I could be refuelling you could be refuelling she could be refuelling we could be refuelling you could be refuelling they could be refuelling
Perfecto
I could have refuelled you could have refuelled she could have refuelled we could have refuelled you could have refuelled they could have refuelled
Perfecto con V-ing
I could have been refuelling you could have been refuelling she could have been refuelling we could have been refuelling you could have been refuelling they could have been refuelling
Negación
Forma simple
I could not refuel you could not refuel she could not refuel we could not refuel you could not refuel they could not refuel
Forma con V-ing
I could not be refuelling you could not be refuelling she could not be refuelling we could not be refuelling you could not be refuelling they could not be refuelling
Perfecto
I could not have refuelled you could not have refuelled she could not have refuelled we could not have refuelled you could not have refuelled they could not have refuelled
Perfecto con V-ing
I could not have been refuelling you could not have been refuelling she could not have been refuelling we could not have been refuelling you could not have been refuelling they could not have been refuelling
Forma interrogativa
Forma simple
could I refuel? could you refuel? could she refuel? could we refuel? could you refuel? could they refuel?
Forma con V-ing
could I be refuelling? could you be refuelling? could she be refuelling? could we be refuelling? could you be refuelling? could they be refuelling?
Perfecto
could I have refuelled? could you have refuelled? could she have refuelled? could we have refuelled? could you have refuelled? could they have refuelled?
Perfecto con V-ing
could I have been refuelling? could you have been refuelling? could she have been refuelling? could we have been refuelling? could you have been refuelling? could they have been refuelling?
Forma interro-negativa
Forma simple
could I not refuel? could you not refuel? could she not refuel? could we not refuel? could you not refuel? could they not refuel?
Forma con V-ing
could I not be refuelling? could you not be refuelling? could she not be refuelling? could we not be refuelling? could you not be refuelling? could they not be refuelling?
Perfecto
could I not have refuelled? could you not have refuelled? could she not have refuelled? could we not have refuelled? could you not have refuelled? could they not have refuelled?
Perfecto con V-ing
could I not have been refuelling? could you not have been refuelling? could she not have been refuelling? could we not have been refuelling? could you not have been refuelling? could they not have been refuelling?