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