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