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