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