English verb conjugation MUST STIFFER

Regular verb: stiffer - stiffered - stiffered

Warning, this verb may not exist. Conjugation is given as example.

Affirmation

Simple form

I must stiffer
you must stiffer
he must stiffer
we must stiffer
you must stiffer
they must stiffer

V-ing form

I must be stiffering
you must be stiffering
he must be stiffering
we must be stiffering
you must be stiffering
they must be stiffering

Perfect

I must have stiffered
you must have stiffered
he must have stiffered
we must have stiffered
you must have stiffered
they must have stiffered

V-ing perfect

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

Negation

Simple form

I must not stiffer
you must not stiffer
he must not stiffer
we must not stiffer
you must not stiffer
they must not stiffer

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

must I stiffer?
must you stiffer?
must he stiffer?
must we stiffer?
must you stiffer?
must they stiffer?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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