English verb conjugation MUST STIFF

Regular verb: stiff - stiffed - stiffed

Affirmation

Simple form

I must stiff
you must stiff
he must stiff
we must stiff
you must stiff
they must stiff

V-ing form

I must be stiffing
you must be stiffing
he must be stiffing
we must be stiffing
you must be stiffing
they must be stiffing

Perfect

I must have stiffed
you must have stiffed
he must have stiffed
we must have stiffed
you must have stiffed
they must have stiffed

V-ing perfect

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

Negation

Simple form

I must not stiff
you must not stiff
he must not stiff
we must not stiff
you must not stiff
they must not stiff

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

must I stiff?
must you stiff?
must he stiff?
must we stiff?
must you stiff?
must they stiff?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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