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