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