English verb conjugation MUST JACKKNIFE

Regular verb: jackknife - jackknifed - jackknifed

Affirmation

Simple form

I must jackknife
you must jackknife
he must jackknife
we must jackknife
you must jackknife
they must jackknife

V-ing form

I must be jackknifing
you must be jackknifing
he must be jackknifing
we must be jackknifing
you must be jackknifing
they must be jackknifing

Perfect

I must have jackknifed
you must have jackknifed
he must have jackknifed
we must have jackknifed
you must have jackknifed
they must have jackknifed

V-ing perfect

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

Negation

Simple form

I mustn't jackknife
you mustn't jackknife
he mustn't jackknife
we mustn't jackknife
you mustn't jackknife
they mustn't jackknife

V-ing form

I mustn't be jackknifing
you mustn't be jackknifing
he mustn't be jackknifing
we mustn't be jackknifing
you mustn't be jackknifing
they mustn't be jackknifing

Perfect

I mustn't have jackknifed
you mustn't have jackknifed
he mustn't have jackknifed
we mustn't have jackknifed
you mustn't have jackknifed
they mustn't have jackknifed

V-ing perfect

I mustn't have been jackknifing
you mustn't have been jackknifing
he mustn't have been jackknifing
we mustn't have been jackknifing
you mustn't have been jackknifing
they mustn't have been jackknifing

Interrogative form

Simple form

must I jackknife?
must you jackknife?
must he jackknife?
must we jackknife?
must you jackknife?
must they jackknife?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

mustn't I jackknife?
mustn't you jackknife?
mustn't he jackknife?
mustn't we jackknife?
mustn't you jackknife?
mustn't they jackknife?

V-ing form

mustn't I be jackknifing?
mustn't you be jackknifing?
mustn't he be jackknifing?
mustn't we be jackknifing?
mustn't you be jackknifing?
mustn't they be jackknifing?

Perfect

mustn't I have jackknifed?
mustn't you have jackknifed?
mustn't he have jackknifed?
mustn't we have jackknifed?
mustn't you have jackknifed?
mustn't they have jackknifed?

V-ing perfect

mustn't I have been jackknifing?
mustn't you have been jackknifing?
mustn't he have been jackknifing?
mustn't we have been jackknifing?
mustn't you have been jackknifing?
mustn't they have been jackknifing?

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