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