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