I can refuel you can refuel he can refuel we can refuel you can refuel they can refuel
V-ing form
I can be refuelling you can be refuelling he can be refuelling we can be refuelling you can be refuelling they can be refuelling
Perfect
I can have refuelled you can have refuelled he can have refuelled we can have refuelled you can have refuelled they can have refuelled
V-ing perfect
I can have been refuelling you can have been refuelling he can have been refuelling we can have been refuelling you can have been refuelling they can have been refuelling
Negation
Simple form
I can't refuel you can't refuel he can't refuel we can't refuel you can't refuel they can't refuel
V-ing form
I can't be refuelling you can't be refuelling he can't be refuelling we can't be refuelling you can't be refuelling they can't be refuelling
Perfect
I can't have refuelled you can't have refuelled he can't have refuelled we can't have refuelled you can't have refuelled they can't have refuelled
V-ing perfect
I can't have been refuelling you can't have been refuelling he can't have been refuelling we can't have been refuelling you can't have been refuelling they can't have been refuelling
Interrogative form
Simple form
can I refuel? can you refuel? can he refuel? can we refuel? can you refuel? can they refuel?
V-ing form
can I be refuelling? can you be refuelling? can he be refuelling? can we be refuelling? can you be refuelling? can they be refuelling?
Perfect
can I have refuelled? can you have refuelled? can he have refuelled? can we have refuelled? can you have refuelled? can they have refuelled?
V-ing perfect
can I have been refuelling? can you have been refuelling? can he have been refuelling? can we have been refuelling? can you have been refuelling? can they have been refuelling?
Interro-negative form
Simple form
can't I refuel? can't you refuel? can't he refuel? can't we refuel? can't you refuel? can't they refuel?
V-ing form
can't I be refuelling? can't you be refuelling? can't he be refuelling? can't we be refuelling? can't you be refuelling? can't they be refuelling?
Perfect
can't I have refuelled? can't you have refuelled? can't he have refuelled? can't we have refuelled? can't you have refuelled? can't they have refuelled?
V-ing perfect
can't I have been refuelling? can't you have been refuelling? can't he have been refuelling? can't we have been refuelling? can't you have been refuelling? can't they have been refuelling?