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