Most nouns ending in -o add -es to form the plural (with some exceptions like photo/photos).
Promo is regular. It follows the -es Addition rule.
Use plural verbs: "The promoes are ready" (not "is ready").
Yes. The plural promoes is standard across all English variants.
The word promo follows the standard English pluralization rule. When forming the plural, promo becomes promoes. This follows the -es Addition pattern, which is one of the most common plural rules in English.
Understanding why promo becomes promoes helps with spelling and pronunciation. Most nouns ending in -o add -es to form the plural (with some exceptions like photo/photos).
When using promoes in writing, remember that it functions as a plural noun in sentences. It pairs with plural verbs and pronouns. For example: "The promoes are ready" (not "is ready"). This subject-verb agreement is essential for grammatical correctness.