English verb conjugation
COULD KEEN

Regular verb: keen - keened - keened

Affirmation

Simple form	V-ing form
I could keen you could keen she could keen we could keen you could keen they could keen	I could be keening you could be keening she could be keening we could be keening you could be keening they could be keening
Perfect	V-ing perfect
I could have keened you could have keened she could have keened we could have keened you could have keened they could have keened	I could have been keening you could have been keening she could have been keening we could have been keening you could have been keening they could have been keening

Negation

Simple form	V-ing form
I couldn't keen you couldn't keen she couldn't keen we couldn't keen you couldn't keen they couldn't keen	I couldn't be keening you couldn't be keening she couldn't be keening we couldn't be keening you couldn't be keening they couldn't be keening
Perfect	V-ing perfect
I couldn't have keened you couldn't have keened she couldn't have keened we couldn't have keened you couldn't have keened they couldn't have keened	I couldn't have been keening you couldn't have been keening she couldn't have been keening we couldn't have been keening you couldn't have been keening they couldn't have been keening

Interrogative form

Simple form	V-ing form
could I keen? could you keen? could she keen? could we keen? could you keen? could they keen?	could I be keening? could you be keening? could she be keening? could we be keening? could you be keening? could they be keening?
Perfect	V-ing perfect
could I have keened? could you have keened? could she have keened? could we have keened? could you have keened? could they have keened?	could I have been keening? could you have been keening? could she have been keening? could we have been keening? could you have been keening? could they have been keening?

Interro-negative form

Simple form	V-ing form
couldn't I keen? couldn't you keen? couldn't she keen? couldn't we keen? couldn't you keen? couldn't they keen?	couldn't I be keening? couldn't you be keening? couldn't she be keening? couldn't we be keening? couldn't you be keening? couldn't they be keening?
Perfect	V-ing perfect
couldn't I have keened? couldn't you have keened? couldn't she have keened? couldn't we have keened? couldn't you have keened? couldn't they have keened?	couldn't I have been keening? couldn't you have been keening? couldn't she have been keening? couldn't we have been keening? couldn't you have been keening? couldn't they have been keening?