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 must not back
you must not back
he must not back
we must not back
you must not back
they must not back

V-ing form

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

Perfect

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

V-ing perfect

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

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

V-ing form

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

Perfect

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

V-ing perfect

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

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