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