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