English verb conjugation CAN STIFFEN

Regular verb: stiffen - stiffened - stiffened

Affirmation

Simple form

I can stiffen
you can stiffen
he can stiffen
we can stiffen
you can stiffen
they can stiffen

V-ing form

I can be stiffening
you can be stiffening
he can be stiffening
we can be stiffening
you can be stiffening
they can be stiffening

Perfect

I can have stiffened
you can have stiffened
he can have stiffened
we can have stiffened
you can have stiffened
they can have stiffened

V-ing perfect

I can have been stiffening
you can have been stiffening
he can have been stiffening
we can have been stiffening
you can have been stiffening
they can have been stiffening

Negation

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

can I stiffen?
can you stiffen?
can he stiffen?
can we stiffen?
can you stiffen?
can they stiffen?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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