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