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