The Conjugator
English verb conjugation
MUST BACK

Regular verb: back - backed - backed

Affirmation

Simple form

V-ing form

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

V-ing 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
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

V-ing 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
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

V-ing 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
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

V-ing form

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

V-ing 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?
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

V-ing 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?
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

V-ing 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?
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?