Warning, this verb may not exist. Conjugation is given as example.
Affirmation
Simple form
I may keen keen you may keen keen he may keen keen we may keen keen you may keen keen they may keen keen
V-ing form
I may be keen keening you may be keen keening he may be keen keening we may be keen keening you may be keen keening they may be keen keening
Perfect
I may have keen keened you may have keen keened he may have keen keened we may have keen keened you may have keen keened they may have keen keened
V-ing perfect
I may have been keen keening you may have been keen keening he may have been keen keening we may have been keen keening you may have been keen keening they may have been keen keening
Negation
Simple form
I mayn't keen keen you mayn't keen keen he mayn't keen keen we mayn't keen keen you mayn't keen keen they mayn't keen keen
V-ing form
I mayn't be keen keening you mayn't be keen keening he mayn't be keen keening we mayn't be keen keening you mayn't be keen keening they mayn't be keen keening
Perfect
I mayn't have keen keened you mayn't have keen keened he mayn't have keen keened we mayn't have keen keened you mayn't have keen keened they mayn't have keen keened
V-ing perfect
I mayn't have been keen keening you mayn't have been keen keening he mayn't have been keen keening we mayn't have been keen keening you mayn't have been keen keening they mayn't have been keen keening
Interrogative form
Simple form
may I keen keen? may you keen keen? may he keen keen? may we keen keen? may you keen keen? may they keen keen?
V-ing form
may I be keen keening? may you be keen keening? may he be keen keening? may we be keen keening? may you be keen keening? may they be keen keening?
Perfect
may I have keen keened? may you have keen keened? may he have keen keened? may we have keen keened? may you have keen keened? may they have keen keened?
V-ing perfect
may I have been keen keening? may you have been keen keening? may he have been keen keening? may we have been keen keening? may you have been keen keening? may they have been keen keening?
Interro-negative form
Simple form
mayn't I keen keen? mayn't you keen keen? mayn't he keen keen? mayn't we keen keen? mayn't you keen keen? mayn't they keen keen?
V-ing form
mayn't I be keen keening? mayn't you be keen keening? mayn't he be keen keening? mayn't we be keen keening? mayn't you be keen keening? mayn't they be keen keening?
Perfect
mayn't I have keen keened? mayn't you have keen keened? mayn't he have keen keened? mayn't we have keen keened? mayn't you have keen keened? mayn't they have keen keened?
V-ing perfect
mayn't I have been keen keening? mayn't you have been keen keening? mayn't he have been keen keening? mayn't we have been keen keening? mayn't you have been keen keening? mayn't they have been keen keening?