I may shack you may shack she may shack we may shack you may shack they may shack
V-ing form
I may be shacking you may be shacking she may be shacking we may be shacking you may be shacking they may be shacking
Perfect
I may have shacked you may have shacked she may have shacked we may have shacked you may have shacked they may have shacked
V-ing perfect
I may have been shacking you may have been shacking she may have been shacking we may have been shacking you may have been shacking they may have been shacking
Negation
Simple form
I may not shack you may not shack she may not shack we may not shack you may not shack they may not shack
V-ing form
I may not be shacking you may not be shacking she may not be shacking we may not be shacking you may not be shacking they may not be shacking
Perfect
I may not have shacked you may not have shacked she may not have shacked we may not have shacked you may not have shacked they may not have shacked
V-ing perfect
I may not have been shacking you may not have been shacking she may not have been shacking we may not have been shacking you may not have been shacking they may not have been shacking
Interrogative form
Simple form
may I shack? may you shack? may she shack? may we shack? may you shack? may they shack?
V-ing form
may I be shacking? may you be shacking? may she be shacking? may we be shacking? may you be shacking? may they be shacking?
Perfect
may I have shacked? may you have shacked? may she have shacked? may we have shacked? may you have shacked? may they have shacked?
V-ing perfect
may I have been shacking? may you have been shacking? may she have been shacking? may we have been shacking? may you have been shacking? may they have been shacking?
Interro-negative form
Simple form
may I not shack? may you not shack? may she not shack? may we not shack? may you not shack? may they not shack?
V-ing form
may I not be shacking? may you not be shacking? may she not be shacking? may we not be shacking? may you not be shacking? may they not be shacking?
Perfect
may I not have shacked? may you not have shacked? may she not have shacked? may we not have shacked? may you not have shacked? may they not have shacked?
V-ing perfect
may I not have been shacking? may you not have been shacking? may she not have been shacking? may we not have been shacking? may you not have been shacking? may they not have been shacking?