There is no consistent rule or explanation for whether you add '-s' or '-es' to nouns ending in 'o'.
Potatoes, tomatoes, heroes, cargoes, gingkoes.
Logos, pianos, zeros, silos, psychos.
Sometimes you can use either, as in tyros/tyroes, geckos/geckoes.
The best thing to do is to learn the most common ones, and look the others up when you need them, without trying to discern any logic. If there is any, it's likely to be too obscure to be useful.
For words that end in O, add either s or es.
Potato is the singular noun. Potatoes is the plural where we add "-es" to form the plural. Most plurals only require an s but some words ending in vowels require the "-es". Potato's is a singular possessive -- for example, "The potato's red skin looked appetizing." It refers to 1 single potato having red skin. Potatoes' is the plural possessive. "The potatoes' red skin looked appetizing." It refers to more than one potato having red skin.
The singular noun is potato.To form the plural, add 'es' to the end of the singular noun.The plural noun is potatoes.Examples:Mom put four potatoes in the oven to bake. (plural)She knows that a baked potato is my favorite. (singular)
To make the word "wash" plural, you simply add an "es" to the end, making it "washes."
For names that end in "ss," simply add an apostrophe followed by "es" to make them plural. For example, "boss" becomes "bosses'" in plural form.
The Y changes to I and you add -es : the plural is adversities.
Change the Y to I and add -es : the plural is poppies.
The plural is epiphanies (Y changes to I, add ES).
No. You don't add an "es" to all-star because if you spell "star" by itself, then you wouldn't add an es, would you? So, you don't add "es".
For words ending in consonants, either add s or es. In this case- es. The plural is kisses.
To form the plural of words ending in 's', you add '-es'. Princess, princesses.
Yes, the plural form of "bonus" is "bonuses." Just add -es to form the plural.