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