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