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