Nouns ending in -s, -x, -z, -ch, or -sh add -es to form the plural. This makes the word easier to pronounce.
Authorities is regular. It follows the -es Addition rule.
Use plural verbs: "The authoritieses are ready" (not "is ready").
Yes. The plural authoritieses is standard across all English variants.
The word authorities follows the standard English pluralization rule. When forming the plural, authorities becomes authoritieses. This follows the -es Addition pattern, which is one of the most common plural rules in English.
Understanding why authorities becomes authoritieses helps with spelling and pronunciation. Nouns ending in -s, -x, -z, -ch, or -sh add -es to form the plural. This makes the word easier to pronounce.
When using authoritieses in writing, remember that it functions as a plural noun in sentences. It pairs with plural verbs and pronouns. For example: "The authoritieses are ready" (not "is ready"). This subject-verb agreement is essential for grammatical correctness.