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