English verb conjugation MUST KEEN

Regular verb: keen - keened - keened

Affirmation

Simple form

I must keen
you must keen
he must keen
we must keen
you must keen
they must keen

V-ing form

I must be keening
you must be keening
he must be keening
we must be keening
you must be keening
they must be keening

Perfect

I must have keened
you must have keened
he must have keened
we must have keened
you must have keened
they must have keened

V-ing perfect

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

Negation

Simple form

I must not keen
you must not keen
he must not keen
we must not keen
you must not keen
they must not keen

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

must I keen?
must you keen?
must he keen?
must we keen?
must you keen?
must they keen?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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