English verb conjugation MUST RETAIN

Regular verb: retain - retained - retained

Affirmation

Simple form

I must retain
you must retain
she must retain
we must retain
you must retain
they must retain

V-ing form

I must be retaining
you must be retaining
she must be retaining
we must be retaining
you must be retaining
they must be retaining

Perfect

I must have retained
you must have retained
she must have retained
we must have retained
you must have retained
they must have retained

V-ing perfect

I must have been retaining
you must have been retaining
she must have been retaining
we must have been retaining
you must have been retaining
they must have been retaining

Negation

Simple form

I must not retain
you must not retain
she must not retain
we must not retain
you must not retain
they must not retain

V-ing form

I must not be retaining
you must not be retaining
she must not be retaining
we must not be retaining
you must not be retaining
they must not be retaining

Perfect

I must not have retained
you must not have retained
she must not have retained
we must not have retained
you must not have retained
they must not have retained

V-ing perfect

I must not have been retaining
you must not have been retaining
she must not have been retaining
we must not have been retaining
you must not have been retaining
they must not have been retaining

Interrogative form

Simple form

must I retain?
must you retain?
must she retain?
must we retain?
must you retain?
must they retain?

V-ing form

must I be retaining?
must you be retaining?
must she be retaining?
must we be retaining?
must you be retaining?
must they be retaining?

Perfect

must I have retained?
must you have retained?
must she have retained?
must we have retained?
must you have retained?
must they have retained?

V-ing perfect

must I have been retaining?
must you have been retaining?
must she have been retaining?
must we have been retaining?
must you have been retaining?
must they have been retaining?

Interro-negative form

Simple form

must I not retain?
must you not retain?
must she not retain?
must we not retain?
must you not retain?
must they not retain?

V-ing form

must I not be retaining?
must you not be retaining?
must she not be retaining?
must we not be retaining?
must you not be retaining?
must they not be retaining?

Perfect

must I not have retained?
must you not have retained?
must she not have retained?
must we not have retained?
must you not have retained?
must they not have retained?

V-ing perfect

must I not have been retaining?
must you not have been retaining?
must she not have been retaining?
must we not have been retaining?
must you not have been retaining?
must they not have been retaining?

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