I may study you may study he may study we may study you may study they may study
V-ing form
I may be studying you may be studying he may be studying we may be studying you may be studying they may be studying
Perfect
I may have studied you may have studied he 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 he 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 he 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 he 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 he 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 he 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 he study? may we study? may you study? may they study?
V-ing form
may I be studying? may you be studying? may he be studying? may we be studying? may you be studying? may they be studying?
Perfect
may I have studied? may you have studied? may he 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 he 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 he 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 he 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 he 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 he have been studying? mayn't we have been studying? mayn't you have been studying? mayn't they have been studying?