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