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