English verb conjugation MAY STIFFEN

Regular verb: stiffen - stiffened - stiffened

Affirmation

Simple form

I may stiffen
you may stiffen
he may stiffen
we may stiffen
you may stiffen
they may stiffen

V-ing form

I may be stiffening
you may be stiffening
he may be stiffening
we may be stiffening
you may be stiffening
they may be stiffening

Perfect

I may have stiffened
you may have stiffened
he may have stiffened
we may have stiffened
you may have stiffened
they may have stiffened

V-ing perfect

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

Negation

Simple form

I may not stiffen
you may not stiffen
he may not stiffen
we may not stiffen
you may not stiffen
they may not stiffen

V-ing form

I may not be stiffening
you may not be stiffening
he may not be stiffening
we may not be stiffening
you may not be stiffening
they may not be stiffening

Perfect

I may not have stiffened
you may not have stiffened
he may not have stiffened
we may not have stiffened
you may not have stiffened
they may not have stiffened

V-ing perfect

I may not have been stiffening
you may not have been stiffening
he may not have been stiffening
we may not have been stiffening
you may not have been stiffening
they may not have been stiffening

Interrogative form

Simple form

may I stiffen?
may you stiffen?
may he stiffen?
may we stiffen?
may you stiffen?
may they stiffen?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

may I not stiffen?
may you not stiffen?
may he not stiffen?
may we not stiffen?
may you not stiffen?
may they not stiffen?

V-ing form

may I not be stiffening?
may you not be stiffening?
may he not be stiffening?
may we not be stiffening?
may you not be stiffening?
may they not be stiffening?

Perfect

may I not have stiffened?
may you not have stiffened?
may he not have stiffened?
may we not have stiffened?
may you not have stiffened?
may they not have stiffened?

V-ing perfect

may I not have been stiffening?
may you not have been stiffening?
may he not have been stiffening?
may we not have been stiffening?
may you not have been stiffening?
may they not have been stiffening?

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