Spelling Plurals: "s" or "es" plural spellings for nouns ending in "o"

(TESOL Worksheets--nouns, spelling, phonics)
Google: drive, slides, pub
[At the Google Docs link above, and embedded below, is a PowerPoint presentation which quizzes the students on how to form the plurals of various nouns ending with "o".  (This was adopted from a lesson in English Word 6, and all of the words are the same as that lesson).
This can probably be adopted to various games, but the one I used was to have all the students run to the left of the room if they thought the plural was formed by adding "s", and run to the right of the room if they thought the plural was formed by adding "es".]