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