English verb conjugation SHOULD STIFFEN

Regular verb: stiffen - stiffened - stiffened

Affirmation

Simple form

I'd stiffen
you'd stiffen
he'd stiffen
we'd stiffen
you'd stiffen
they'd stiffen

V-ing form

I'd be stiffening
you'd be stiffening
he'd be stiffening
we'd be stiffening
you'd be stiffening
they'd be stiffening

Perfect

I should've stiffened
you should've stiffened
he should've stiffened
we should've stiffened
you should've stiffened
they should've stiffened

V-ing perfect

I should've been stiffening
you should've been stiffening
he should've been stiffening
we should've been stiffening
you should've been stiffening
they should've been stiffening

Negation

Simple form

I shouldn't stiffen
you shouldn't stiffen
he shouldn't stiffen
we shouldn't stiffen
you shouldn't stiffen
they shouldn't stiffen

V-ing form

I shouldn't be stiffening
you shouldn't be stiffening
he shouldn't be stiffening
we shouldn't be stiffening
you shouldn't be stiffening
they shouldn't be stiffening

Perfect

I shouldn't have stiffened
you shouldn't have stiffened
he shouldn't have stiffened
we shouldn't have stiffened
you shouldn't have stiffened
they shouldn't have stiffened

V-ing perfect

I shouldn't have been stiffening
you shouldn't have been stiffening
he shouldn't have been stiffening
we shouldn't have been stiffening
you shouldn't have been stiffening
they shouldn't have been stiffening

Interrogative form

Simple form

should I stiffen?
should you stiffen?
should he stiffen?
should we stiffen?
should you stiffen?
should they stiffen?

V-ing form

should I be stiffening?
should you be stiffening?
should he be stiffening?
should we be stiffening?
should you be stiffening?
should they be stiffening?

Perfect

should I have stiffened?
should you have stiffened?
should he have stiffened?
should we have stiffened?
should you have stiffened?
should they have stiffened?

V-ing perfect

should I have been stiffening?
should you have been stiffening?
should he have been stiffening?
should we have been stiffening?
should you have been stiffening?
should they have been stiffening?

Interro-negative form

Simple form

shouldn't I stiffen?
shouldn't you stiffen?
shouldn't he stiffen?
shouldn't we stiffen?
shouldn't you stiffen?
shouldn't they stiffen?

V-ing form

shouldn't I be stiffening?
shouldn't you be stiffening?
shouldn't he be stiffening?
shouldn't we be stiffening?
shouldn't you be stiffening?
shouldn't they be stiffening?

Perfect

shouldn't I have stiffened?
shouldn't you have stiffened?
shouldn't he have stiffened?
shouldn't we have stiffened?
shouldn't you have stiffened?
shouldn't they have stiffened?

V-ing perfect

shouldn't I have been stiffening?
shouldn't you have been stiffening?
shouldn't he have been stiffening?
shouldn't we have been stiffening?
shouldn't you have been stiffening?
shouldn't they have been stiffening?

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