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