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