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