English verb conjugation MUST RIFF

Regular verb: riff - riffed - riffed

Affirmation

Simple form

I must riff
you must riff
he must riff
we must riff
you must riff
they must riff

V-ing form

I must be riffing
you must be riffing
he must be riffing
we must be riffing
you must be riffing
they must be riffing

Perfect

I must have riffed
you must have riffed
he must have riffed
we must have riffed
you must have riffed
they must have riffed

V-ing perfect

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

Negation

Simple form

I must not riff
you must not riff
he must not riff
we must not riff
you must not riff
they must not riff

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

must I riff?
must you riff?
must he riff?
must we riff?
must you riff?
must they riff?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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