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