English verb conjugation MUST BACKFIT

Irregular verb: backfit - backfit, backfitted - backfit, backfitted

Affirmation

Simple form

I must backfit
you must backfit
he must backfit
we must backfit
you must backfit
they must backfit

V-ing form

I must be backfiting
you must be backfiting
he must be backfiting
we must be backfiting
you must be backfiting
they must be backfiting

Perfect

I must have backfit, backfitted
you must have backfit, backfitted
he must have backfit, backfitted
we must have backfit, backfitted
you must have backfit, backfitted
they must have backfit, backfitted

V-ing perfect

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

Negation

Simple form

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

V-ing form

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

Perfect

I mustn't have backfit, backfitted
you mustn't have backfit, backfitted
he mustn't have backfit, backfitted
we mustn't have backfit, backfitted
you mustn't have backfit, backfitted
they mustn't have backfit, backfitted

V-ing perfect

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

Interrogative form

Simple form

must I backfit?
must you backfit?
must he backfit?
must we backfit?
must you backfit?
must they backfit?

V-ing form

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

Perfect

must I have backfit, backfitted?
must you have backfit, backfitted?
must he have backfit, backfitted?
must we have backfit, backfitted?
must you have backfit, backfitted?
must they have backfit, backfitted?

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

mustn't I have backfit, backfitted?
mustn't you have backfit, backfitted?
mustn't he have backfit, backfitted?
mustn't we have backfit, backfitted?
mustn't you have backfit, backfitted?
mustn't they have backfit, backfitted?

V-ing perfect

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

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