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