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