English verb conjugation
TO STIFFEN

Regular verb: stiffen - stiffened - stiffened

Indicative

Present	Present continuous	Preterite	Preterite continuous
don't I stiffen? don't you stiffen? doesn't she stiffen? don't we stiffen? don't you stiffen? don't they stiffen?	am I not stiffening? aren't you stiffening? isn't she stiffening? aren't we stiffening? aren't you stiffening? aren't they stiffening?	didn't I stiffen? didn't you stiffen? didn't she stiffen? didn't we stiffen? didn't you stiffen? didn't they stiffen?	wasn't I stiffening? weren't you stiffening? wasn't she stiffening? weren't we stiffening? weren't you stiffening? weren't they stiffening?
Present perfect	Present perfect continuous	Pluperfect	Pluperfect continuous
haven't I stiffened? haven't you stiffened? hasn't she stiffened? haven't we stiffened? haven't you stiffened? haven't they stiffened?	haven't I been stiffening? haven't you been stiffening? hasn't she been stiffening? haven't we been stiffening? haven't you been stiffening? haven't they been stiffening?	hadn't I stiffened? hadn't you stiffened? hadn't she stiffened? hadn't we stiffened? hadn't you stiffened? hadn't they stiffened?	hadn't I been stiffening? hadn't you been stiffening? hadn't she been stiffening? hadn't we been stiffening? hadn't you been stiffening? hadn't they been stiffening?
Future	Future continuous	Future perfect	Future perfect continuous
won't I stiffen? won't you stiffen? won't she stiffen? won't we stiffen? won't you stiffen? won't they stiffen?	won't I be stiffening? won't you be stiffening? won't she be stiffening? won't we be stiffening? won't you be stiffening? won't they be stiffening?	won't I have stiffened? won't you have stiffened? won't she have stiffened? won't we have stiffened? won't you have stiffened? won't they have stiffened?	won't I have been stiffening? won't you have been stiffening? won't she have been stiffening? won't we have been stiffening? won't you have been stiffening? won't they have been stiffening?

Conditional

Present	Present continuous	Past	Past continuous
wouldn't I stiffen? wouldn't you stiffen? wouldn't she stiffen? wouldn't we stiffen? wouldn't you stiffen? wouldn't they stiffen?	wouldn't I be stiffening? wouldn't you be stiffening? wouldn't she be stiffening? wouldn't we be stiffening? wouldn't you be stiffening? wouldn't they be stiffening?	wouldn't I have stiffened? wouldn't you have stiffened? wouldn't she have stiffened? wouldn't we have stiffened? wouldn't you have stiffened? wouldn't they have stiffened?	wouldn't I have been stiffening? wouldn't you have been stiffening? wouldn't she have been stiffening? wouldn't we have been stiffening? wouldn't you have been stiffening? wouldn't they have been stiffening?

Infinitive

Imperative

Infinitive		Imperative
to stiffen		- - -

Participle

Present	Past
stiffening	stiffened