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