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