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