I may exist you may exist she may exist we may exist you may exist they may exist
V-ing form
I may be existing you may be existing she may be existing we may be existing you may be existing they may be existing
Perfect
I may have existed you may have existed she may have existed we may have existed you may have existed they may have existed
V-ing perfect
I may have been existing you may have been existing she may have been existing we may have been existing you may have been existing they may have been existing
Negation
Simple form
I may not exist you may not exist she may not exist we may not exist you may not exist they may not exist
V-ing form
I may not be existing you may not be existing she may not be existing we may not be existing you may not be existing they may not be existing
Perfect
I may not have existed you may not have existed she may not have existed we may not have existed you may not have existed they may not have existed
V-ing perfect
I may not have been existing you may not have been existing she may not have been existing we may not have been existing you may not have been existing they may not have been existing
Interrogative form
Simple form
may I exist? may you exist? may she exist? may we exist? may you exist? may they exist?
V-ing form
may I be existing? may you be existing? may she be existing? may we be existing? may you be existing? may they be existing?
Perfect
may I have existed? may you have existed? may she have existed? may we have existed? may you have existed? may they have existed?
V-ing perfect
may I have been existing? may you have been existing? may she have been existing? may we have been existing? may you have been existing? may they have been existing?
Interro-negative form
Simple form
may I not exist? may you not exist? may she not exist? may we not exist? may you not exist? may they not exist?
V-ing form
may I not be existing? may you not be existing? may she not be existing? may we not be existing? may you not be existing? may they not be existing?
Perfect
may I not have existed? may you not have existed? may she not have existed? may we not have existed? may you not have existed? may they not have existed?
V-ing perfect
may I not have been existing? may you not have been existing? may she not have been existing? may we not have been existing? may you not have been existing? may they not have been existing?