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