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