English verb conjugation COULD STIFFER

Regular verb: stiffer - stiffered - stiffered

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

Affirmation

Simple form

I could stiffer
you could stiffer
she could stiffer
we could stiffer
you could stiffer
they could stiffer

V-ing form

I could be stiffering
you could be stiffering
she could be stiffering
we could be stiffering
you could be stiffering
they could be stiffering

Perfect

I could have stiffered
you could have stiffered
she could have stiffered
we could have stiffered
you could have stiffered
they could have stiffered

V-ing perfect

I could have been stiffering
you could have been stiffering
she could have been stiffering
we could have been stiffering
you could have been stiffering
they could have been stiffering

Negation

Simple form

I couldn't stiffer
you couldn't stiffer
she couldn't stiffer
we couldn't stiffer
you couldn't stiffer
they couldn't stiffer

V-ing form

I couldn't be stiffering
you couldn't be stiffering
she couldn't be stiffering
we couldn't be stiffering
you couldn't be stiffering
they couldn't be stiffering

Perfect

I couldn't have stiffered
you couldn't have stiffered
she couldn't have stiffered
we couldn't have stiffered
you couldn't have stiffered
they couldn't have stiffered

V-ing perfect

I couldn't have been stiffering
you couldn't have been stiffering
she couldn't have been stiffering
we couldn't have been stiffering
you couldn't have been stiffering
they couldn't have been stiffering

Interrogative form

Simple form

could I stiffer?
could you stiffer?
could she stiffer?
could we stiffer?
could you stiffer?
could they stiffer?

V-ing form

could I be stiffering?
could you be stiffering?
could she be stiffering?
could we be stiffering?
could you be stiffering?
could they be stiffering?

Perfect

could I have stiffered?
could you have stiffered?
could she have stiffered?
could we have stiffered?
could you have stiffered?
could they have stiffered?

V-ing perfect

could I have been stiffering?
could you have been stiffering?
could she have been stiffering?
could we have been stiffering?
could you have been stiffering?
could they have been stiffering?

Interro-negative form

Simple form

couldn't I stiffer?
couldn't you stiffer?
couldn't she stiffer?
couldn't we stiffer?
couldn't you stiffer?
couldn't they stiffer?

V-ing form

couldn't I be stiffering?
couldn't you be stiffering?
couldn't she be stiffering?
couldn't we be stiffering?
couldn't you be stiffering?
couldn't they be stiffering?

Perfect

couldn't I have stiffered?
couldn't you have stiffered?
couldn't she have stiffered?
couldn't we have stiffered?
couldn't you have stiffered?
couldn't they have stiffered?

V-ing perfect

couldn't I have been stiffering?
couldn't you have been stiffering?
couldn't she have been stiffering?
couldn't we have been stiffering?
couldn't you have been stiffering?
couldn't they have been stiffering?

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