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