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