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