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