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