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