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