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