I may crowd you may crowd she may crowd we may crowd you may crowd they may crowd
V-ing form
I may be crowding you may be crowding she may be crowding we may be crowding you may be crowding they may be crowding
Perfect
I may have crowded you may have crowded she may have crowded we may have crowded you may have crowded they may have crowded
V-ing perfect
I may have been crowding you may have been crowding she may have been crowding we may have been crowding you may have been crowding they may have been crowding
Negation
Simple form
I mayn't crowd you mayn't crowd she mayn't crowd we mayn't crowd you mayn't crowd they mayn't crowd
V-ing form
I mayn't be crowding you mayn't be crowding she mayn't be crowding we mayn't be crowding you mayn't be crowding they mayn't be crowding
Perfect
I mayn't have crowded you mayn't have crowded she mayn't have crowded we mayn't have crowded you mayn't have crowded they mayn't have crowded
V-ing perfect
I mayn't have been crowding you mayn't have been crowding she mayn't have been crowding we mayn't have been crowding you mayn't have been crowding they mayn't have been crowding
Interrogative form
Simple form
may I crowd? may you crowd? may she crowd? may we crowd? may you crowd? may they crowd?
V-ing form
may I be crowding? may you be crowding? may she be crowding? may we be crowding? may you be crowding? may they be crowding?
Perfect
may I have crowded? may you have crowded? may she have crowded? may we have crowded? may you have crowded? may they have crowded?
V-ing perfect
may I have been crowding? may you have been crowding? may she have been crowding? may we have been crowding? may you have been crowding? may they have been crowding?
Interro-negative form
Simple form
mayn't I crowd? mayn't you crowd? mayn't she crowd? mayn't we crowd? mayn't you crowd? mayn't they crowd?
V-ing form
mayn't I be crowding? mayn't you be crowding? mayn't she be crowding? mayn't we be crowding? mayn't you be crowding? mayn't they be crowding?
Perfect
mayn't I have crowded? mayn't you have crowded? mayn't she have crowded? mayn't we have crowded? mayn't you have crowded? mayn't they have crowded?
V-ing perfect
mayn't I have been crowding? mayn't you have been crowding? mayn't she have been crowding? mayn't we have been crowding? mayn't you have been crowding? mayn't they have been crowding?