Warning, this verb may not exist. Conjugation is given as example.
Affirmation
Simple form
I can keen keen you can keen keen she 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 she 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 she 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 she 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 she 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 she 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 she 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 she 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 she 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 she 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 she 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 she 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 she 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 she 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 she 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 she 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?