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