English verb conjugation MUST FAIL

Regular verb: fail - failed - failed

Affirmation

Simple form

I must fail
you must fail
he must fail
we must fail
you must fail
they must fail

V-ing form

I must be failing
you must be failing
he must be failing
we must be failing
you must be failing
they must be failing

Perfect

I must have failed
you must have failed
he must have failed
we must have failed
you must have failed
they must have failed

V-ing perfect

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

Negation

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

must I fail?
must you fail?
must he fail?
must we fail?
must you fail?
must they fail?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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