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