I may board you may board he may board we may board you may board they may board
V-ing form
I may be boarding you may be boarding he may be boarding we may be boarding you may be boarding they may be boarding
Perfect
I may have boarded you may have boarded he may have boarded we may have boarded you may have boarded they may have boarded
V-ing perfect
I may have been boarding you may have been boarding he may have been boarding we may have been boarding you may have been boarding they may have been boarding
Negation
Simple form
I may not board you may not board he may not board we may not board you may not board they may not board
V-ing form
I may not be boarding you may not be boarding he may not be boarding we may not be boarding you may not be boarding they may not be boarding
Perfect
I may not have boarded you may not have boarded he may not have boarded we may not have boarded you may not have boarded they may not have boarded
V-ing perfect
I may not have been boarding you may not have been boarding he may not have been boarding we may not have been boarding you may not have been boarding they may not have been boarding
Interrogative form
Simple form
may I board? may you board? may he board? may we board? may you board? may they board?
V-ing form
may I be boarding? may you be boarding? may he be boarding? may we be boarding? may you be boarding? may they be boarding?
Perfect
may I have boarded? may you have boarded? may he have boarded? may we have boarded? may you have boarded? may they have boarded?
V-ing perfect
may I have been boarding? may you have been boarding? may he have been boarding? may we have been boarding? may you have been boarding? may they have been boarding?
Interro-negative form
Simple form
may I not board? may you not board? may he not board? may we not board? may you not board? may they not board?
V-ing form
may I not be boarding? may you not be boarding? may he not be boarding? may we not be boarding? may you not be boarding? may they not be boarding?
Perfect
may I not have boarded? may you not have boarded? may he not have boarded? may we not have boarded? may you not have boarded? may they not have boarded?
V-ing perfect
may I not have been boarding? may you not have been boarding? may he not have been boarding? may we not have been boarding? may you not have been boarding? may they not have been boarding?