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