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male gender | Modal : no | may | might | can | could | shall | should | will | would | must | ought to

English verb conjugation CAN STIFFEN

Regular verb: stiffen - stiffened - stiffened


Affirmation

Simple form
I can stiffen
you can stiffen
she can stiffen
we can stiffen
you can stiffen
they can stiffen
V-ing form
I can be stiffening
you can be stiffening
she can be stiffening
we can be stiffening
you can be stiffening
they can be stiffening
Perfect
I can have stiffened
you can have stiffened
she 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
she 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
she 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
she 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
she 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
she 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 she stiffen?
can we stiffen?
can you stiffen?
can they stiffen?
V-ing form
can I be stiffening?
can you be stiffening?
can she be stiffening?
can we be stiffening?
can you be stiffening?
can they be stiffening?
Perfect
can I have stiffened?
can you have stiffened?
can she 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 she 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 she 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 she 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 she 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 she have been stiffening?
can't we have been stiffening?
can't you have been stiffening?
can't they have been stiffening?