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