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