I may sire you may sire he may sire we may sire you may sire they may sire
V-ing form
I may be siring you may be siring he may be siring we may be siring you may be siring they may be siring
Perfect
I may have sired you may have sired he 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 he may have been siring we may have been siring you may have been siring they may have been siring
Negation
Simple form
I mayn't sire you mayn't sire he mayn't sire we mayn't sire you mayn't sire they mayn't sire
V-ing form
I mayn't be siring you mayn't be siring he mayn't be siring we mayn't be siring you mayn't be siring they mayn't be siring
Perfect
I mayn't have sired you mayn't have sired he mayn't have sired we mayn't have sired you mayn't have sired they mayn't have sired
V-ing perfect
I mayn't have been siring you mayn't have been siring he mayn't have been siring we mayn't have been siring you mayn't have been siring they mayn't have been siring
Interrogative form
Simple form
may I sire? may you sire? may he sire? may we sire? may you sire? may they sire?
V-ing form
may I be siring? may you be siring? may he be siring? may we be siring? may you be siring? may they be siring?
Perfect
may I have sired? may you have sired? may he 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 he have been siring? may we have been siring? may you have been siring? may they have been siring?
Interro-negative form
Simple form
mayn't I sire? mayn't you sire? mayn't he sire? mayn't we sire? mayn't you sire? mayn't they sire?
V-ing form
mayn't I be siring? mayn't you be siring? mayn't he be siring? mayn't we be siring? mayn't you be siring? mayn't they be siring?
Perfect
mayn't I have sired? mayn't you have sired? mayn't he have sired? mayn't we have sired? mayn't you have sired? mayn't they have sired?
V-ing perfect
mayn't I have been siring? mayn't you have been siring? mayn't he have been siring? mayn't we have been siring? mayn't you have been siring? mayn't they have been siring?