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