This noun follows the standard English plural rule: simply add -s to the singular form.
Stiffen is regular. It follows the Standard -s rule.
Use plural verbs: "The stiffens are ready" (not "is ready").
Yes. The plural stiffens is standard across all English variants.
The word stiffen follows the standard English pluralization rule. When forming the plural, stiffen becomes stiffens. This follows the Standard -s pattern, which is one of the most common plural rules in English.
Understanding why stiffen becomes stiffens helps with spelling and pronunciation. This noun follows the standard English plural rule: simply add -s to the singular form.
When using stiffens in writing, remember that it functions as a plural noun in sentences. It pairs with plural verbs and pronouns. For example: "The stiffens are ready" (not "is ready"). This subject-verb agreement is essential for grammatical correctness.