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