Conjugations of the English verb stiffen can be found below. Click the translation icon Translation button to translate each conjugation. Improve your vocabulary and boost your learning by taking the above online verb test.
 

Indicative

Present
T
I stiffen (with cardboard)
you stiffen (with cardboard)
he stiffens (with cardboard)
we stiffen (with cardboard)
they stiffen (with cardboard)
Perfect
T
I have stiffened (with cardboard)
you have stiffened (with cardboard)
he has stiffened (with cardboard)
we have stiffened (with cardboard)
they have stiffened (with cardboard)
Past
I stiffened (with cardboard)
you stiffened (with cardboard)
he stiffened (with cardboard)
we stiffened (with cardboard)
they stiffened (with cardboard)
Pluperfect
I had stiffened (with cardboard)
you had stiffened (with cardboard)
he had stiffened (with cardboard)
we had stiffened (with cardboard)
they had stiffened (with cardboard)
Future
I will stiffen (with cardboard)
you will stiffen (with cardboard)
he will stiffen (with cardboard)
we will stiffen (with cardboard)
they will stiffen (with cardboard)
Future perfect
I will have stiffened (with cardboard)
you will have stiffened (with cardboard)
he will have stiffened (with cardboard)
we will have stiffened (with cardboard)
they will have stiffened (with cardboard)

Imperative

Present
stiffen (with cardboard)!
let's stiffen (with cardboard)!
 
 
 

Conditional

Present
I would stiffen (with cardboard)
you would stiffen (with cardboard)
he would stiffen (with cardboard)
we would stiffen (with cardboard)
they would stiffen (with cardboard)
Perfect
I would have stiffened (with cardboard)
you would have stiffened (with cardboard)
he would have stiffened (with cardboard)
we would have stiffened (with cardboard)
they would have stiffened (with cardboard)

Conjunctive

Present
I stiffen (with cardboard)
you stiffen (with cardboard)
he stiffen (with cardboard)
we stiffen (with cardboard)
they stiffen (with cardboard)
Perfect
I have stiffened (with cardboard)
you have stiffened (with cardboard)
he have stiffened (with cardboard)
we have stiffened (with cardboard)
they have stiffened (with cardboard)
Past
 
I stiffened (with cardboard)
you stiffened (with cardboard)
he stiffened (with cardboard)
we stiffened (with cardboard)
they stiffened (with cardboard)
Pluperfect
 
I had stiffened (with cardboard)
you had stiffened (with cardboard)
he had stiffened (with cardboard)
we had stiffened (with cardboard)
they had stiffened (with cardboard)

Participle

Gerund
stiffening (with cardboard)
Past
stiffened (with cardboard)
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