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