English verb conjugation
TO STIFFEN
Regular verb: stiffen - stiffened - stiffened
Present | Present continuous | Preterite | Preterite continuous |
| I stiffen you stiffen he stiffens we stiffen you stiffen they stiffen | I'm stiffening you're stiffening he's stiffening we're stiffening you're stiffening they're stiffening | I stiffened you stiffened he stiffened we stiffened you stiffened they stiffened | I was stiffening you were stiffening he was stiffening we were stiffening you were stiffening they were stiffening |
Present perfect | Present perfect continuous | Pluperfect | Pluperfect continuous |
| I've stiffened you've stiffened he's stiffened we've stiffened you've stiffened they've stiffened | I've been stiffening you've been stiffening he's been stiffening we've been stiffening you've been stiffening they've been stiffening | I'd stiffened you'd stiffened he'd stiffened we'd stiffened you'd stiffened they'd stiffened | I'd been stiffening you'd been stiffening he'd been stiffening we'd been stiffening you'd been stiffening they'd been stiffening |
Future | Future continuous | Future perfect | Future perfect continuous |
| I'll stiffen you'll stiffen he'll stiffen we'll stiffen you'll stiffen they'll stiffen | I'll be stiffening you'll be stiffening he'll be stiffening we'll be stiffening you'll be stiffening they'll be stiffening | I'll have stiffened you'll have stiffened he'll have stiffened we'll have stiffened you'll have stiffened they'll have stiffened | I'll have been stiffening you'll have been stiffening he'll have been stiffening we'll have been stiffening you'll have been stiffening they'll have been stiffening |
Present | Present continuous | Past | Past continuous |
| I'd stiffen you'd stiffen he'd stiffen we'd stiffen you'd stiffen they'd stiffen | I'd be stiffening you'd be stiffening he'd be stiffening we'd be stiffening you'd be stiffening they'd be stiffening | I'd have stiffened you'd have stiffened he'd have stiffened we'd have stiffened you'd have stiffened they'd have stiffened | I'd have been stiffening you'd have been stiffening he'd have been stiffening we'd have been stiffening you'd have been stiffening they'd have been stiffening |
Infinitive | Imperative |
Infinitive | Imperative | ||
| to stiffen | stiffen Let's stiffen stiffen |
Present | Past | ||
| stiffening | stiffened |