I may add you may add he may add we may add you may add they may add
V-ing form
I may be adding you may be adding he may be adding we may be adding you may be adding they may be adding
Perfect
I may have added you may have added he may have added we may have added you may have added they may have added
V-ing perfect
I may have been adding you may have been adding he may have been adding we may have been adding you may have been adding they may have been adding
Negation
Simple form
I may not add you may not add he may not add we may not add you may not add they may not add
V-ing form
I may not be adding you may not be adding he may not be adding we may not be adding you may not be adding they may not be adding
Perfect
I may not have added you may not have added he may not have added we may not have added you may not have added they may not have added
V-ing perfect
I may not have been adding you may not have been adding he may not have been adding we may not have been adding you may not have been adding they may not have been adding
Interrogative form
Simple form
may I add? may you add? may he add? may we add? may you add? may they add?
V-ing form
may I be adding? may you be adding? may he be adding? may we be adding? may you be adding? may they be adding?
Perfect
may I have added? may you have added? may he have added? may we have added? may you have added? may they have added?
V-ing perfect
may I have been adding? may you have been adding? may he have been adding? may we have been adding? may you have been adding? may they have been adding?
Interro-negative form
Simple form
may I not add? may you not add? may he not add? may we not add? may you not add? may they not add?
V-ing form
may I not be adding? may you not be adding? may he not be adding? may we not be adding? may you not be adding? may they not be adding?
Perfect
may I not have added? may you not have added? may he not have added? may we not have added? may you not have added? may they not have added?
V-ing perfect
may I not have been adding? may you not have been adding? may he not have been adding? may we not have been adding? may you not have been adding? may they not have been adding?