English verb conjugation MUST BACK

Regular verb: back - backed - backed

Affirmation

Simple form

I must back
you must back
he must back
we must back
you must back
they must back

V-ing form

I must be backing
you must be backing
he must be backing
we must be backing
you must be backing
they must be backing

Perfect

I must have backed
you must have backed
he must have backed
we must have backed
you must have backed
they must have backed

V-ing perfect

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

Negation

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

must I back?
must you back?
must he back?
must we back?
must you back?
must they back?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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