English verb conjugation COULD KEEN

Regular verb: keen - keened - keened

Affirmation

Simple form

I could keen
you could keen
he could keen
we could keen
you could keen
they could keen

V-ing form

I could be keening
you could be keening
he could be keening
we could be keening
you could be keening
they could be keening

Perfect

I could have keened
you could have keened
he could have keened
we could have keened
you could have keened
they could have keened

V-ing perfect

I could have been keening
you could have been keening
he could have been keening
we could have been keening
you could have been keening
they could have been keening

Negation

Simple form

I could not keen
you could not keen
he could not keen
we could not keen
you could not keen
they could not keen

V-ing form

I could not be keening
you could not be keening
he could not be keening
we could not be keening
you could not be keening
they could not be keening

Perfect

I could not have keened
you could not have keened
he could not have keened
we could not have keened
you could not have keened
they could not have keened

V-ing perfect

I could not have been keening
you could not have been keening
he could not have been keening
we could not have been keening
you could not have been keening
they could not have been keening

Interrogative form

Simple form

could I keen?
could you keen?
could he keen?
could we keen?
could you keen?
could they keen?

V-ing form

could I be keening?
could you be keening?
could he be keening?
could we be keening?
could you be keening?
could they be keening?

Perfect

could I have keened?
could you have keened?
could he have keened?
could we have keened?
could you have keened?
could they have keened?

V-ing perfect

could I have been keening?
could you have been keening?
could he have been keening?
could we have been keening?
could you have been keening?
could they have been keening?

Interro-negative form

Simple form

could I not keen?
could you not keen?
could he not keen?
could we not keen?
could you not keen?
could they not keen?

V-ing form

could I not be keening?
could you not be keening?
could he not be keening?
could we not be keening?
could you not be keening?
could they not be keening?

Perfect

could I not have keened?
could you not have keened?
could he not have keened?
could we not have keened?
could you not have keened?
could they not have keened?

V-ing perfect

could I not have been keening?
could you not have been keening?
could he not have been keening?
could we not have been keening?
could you not have been keening?
could they not have been keening?

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