I may sire you may sire she may sire we may sire you may sire they may sire
V-ing form
I may be siring you may be siring she may be siring we may be siring you may be siring they may be siring
Perfect
I may have sired you may have sired she may have sired we may have sired you may have sired they may have sired
V-ing perfect
I may have been siring you may have been siring she may have been siring we may have been siring you may have been siring they may have been siring
Negation
Simple form
I may not sire you may not sire she may not sire we may not sire you may not sire they may not sire
V-ing form
I may not be siring you may not be siring she may not be siring we may not be siring you may not be siring they may not be siring
Perfect
I may not have sired you may not have sired she may not have sired we may not have sired you may not have sired they may not have sired
V-ing perfect
I may not have been siring you may not have been siring she may not have been siring we may not have been siring you may not have been siring they may not have been siring
Interrogative form
Simple form
may I sire? may you sire? may she sire? may we sire? may you sire? may they sire?
V-ing form
may I be siring? may you be siring? may she be siring? may we be siring? may you be siring? may they be siring?
Perfect
may I have sired? may you have sired? may she have sired? may we have sired? may you have sired? may they have sired?
V-ing perfect
may I have been siring? may you have been siring? may she have been siring? may we have been siring? may you have been siring? may they have been siring?
Interro-negative form
Simple form
may I not sire? may you not sire? may she not sire? may we not sire? may you not sire? may they not sire?
V-ing form
may I not be siring? may you not be siring? may she not be siring? may we not be siring? may you not be siring? may they not be siring?
Perfect
may I not have sired? may you not have sired? may she not have sired? may we not have sired? may you not have sired? may they not have sired?
V-ing perfect
may I not have been siring? may you not have been siring? may she not have been siring? may we not have been siring? may you not have been siring? may they not have been siring?