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