I may tack you may tack he may tack we may tack you may tack they may tack
V-ing form
I may be tacking you may be tacking he may be tacking we may be tacking you may be tacking they may be tacking
Perfect
I may have tacked you may have tacked he may have tacked we may have tacked you may have tacked they may have tacked
V-ing perfect
I may have been tacking you may have been tacking he may have been tacking we may have been tacking you may have been tacking they may have been tacking
Negation
Simple form
I may not tack you may not tack he may not tack we may not tack you may not tack they may not tack
V-ing form
I may not be tacking you may not be tacking he may not be tacking we may not be tacking you may not be tacking they may not be tacking
Perfect
I may not have tacked you may not have tacked he may not have tacked we may not have tacked you may not have tacked they may not have tacked
V-ing perfect
I may not have been tacking you may not have been tacking he may not have been tacking we may not have been tacking you may not have been tacking they may not have been tacking
Interrogative form
Simple form
may I tack? may you tack? may he tack? may we tack? may you tack? may they tack?
V-ing form
may I be tacking? may you be tacking? may he be tacking? may we be tacking? may you be tacking? may they be tacking?
Perfect
may I have tacked? may you have tacked? may he have tacked? may we have tacked? may you have tacked? may they have tacked?
V-ing perfect
may I have been tacking? may you have been tacking? may he have been tacking? may we have been tacking? may you have been tacking? may they have been tacking?
Interro-negative form
Simple form
may I not tack? may you not tack? may he not tack? may we not tack? may you not tack? may they not tack?
V-ing form
may I not be tacking? may you not be tacking? may he not be tacking? may we not be tacking? may you not be tacking? may they not be tacking?
Perfect
may I not have tacked? may you not have tacked? may he not have tacked? may we not have tacked? may you not have tacked? may they not have tacked?
V-ing perfect
may I not have been tacking? may you not have been tacking? may he not have been tacking? may we not have been tacking? may you not have been tacking? may they not have been tacking?