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 must not fail
you must not fail
he must not fail
we must not fail
you must not fail
they must not fail

V-ing form

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

Perfect

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

V-ing perfect

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

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

V-ing form

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

Perfect

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

V-ing perfect

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