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