English verb conjugation MUST BIFF

Regular verb: biff - biffed - biffed

Affirmation

Simple form

I must biff
you must biff
he must biff
we must biff
you must biff
they must biff

V-ing form

I must be biffing
you must be biffing
he must be biffing
we must be biffing
you must be biffing
they must be biffing

Perfect

I must have biffed
you must have biffed
he must have biffed
we must have biffed
you must have biffed
they must have biffed

V-ing perfect

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

Negation

Simple form

I must not biff
you must not biff
he must not biff
we must not biff
you must not biff
they must not biff

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

must I biff?
must you biff?
must he biff?
must we biff?
must you biff?
must they biff?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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