I may bum you may bum he may bum we may bum you may bum they may bum
V-ing form
I may be bumming you may be bumming he may be bumming we may be bumming you may be bumming they may be bumming
Perfect
I may have bummed you may have bummed he may have bummed we may have bummed you may have bummed they may have bummed
V-ing perfect
I may have been bumming you may have been bumming he may have been bumming we may have been bumming you may have been bumming they may have been bumming
Negation
Simple form
I may not bum you may not bum he may not bum we may not bum you may not bum they may not bum
V-ing form
I may not be bumming you may not be bumming he may not be bumming we may not be bumming you may not be bumming they may not be bumming
Perfect
I may not have bummed you may not have bummed he may not have bummed we may not have bummed you may not have bummed they may not have bummed
V-ing perfect
I may not have been bumming you may not have been bumming he may not have been bumming we may not have been bumming you may not have been bumming they may not have been bumming
Interrogative form
Simple form
may I bum? may you bum? may he bum? may we bum? may you bum? may they bum?
V-ing form
may I be bumming? may you be bumming? may he be bumming? may we be bumming? may you be bumming? may they be bumming?
Perfect
may I have bummed? may you have bummed? may he have bummed? may we have bummed? may you have bummed? may they have bummed?
V-ing perfect
may I have been bumming? may you have been bumming? may he have been bumming? may we have been bumming? may you have been bumming? may they have been bumming?
Interro-negative form
Simple form
may I not bum? may you not bum? may he not bum? may we not bum? may you not bum? may they not bum?
V-ing form
may I not be bumming? may you not be bumming? may he not be bumming? may we not be bumming? may you not be bumming? may they not be bumming?
Perfect
may I not have bummed? may you not have bummed? may he not have bummed? may we not have bummed? may you not have bummed? may they not have bummed?
V-ing perfect
may I not have been bumming? may you not have been bumming? may he not have been bumming? may we not have been bumming? may you not have been bumming? may they not have been bumming?