How to form a third person singular with verb ending in 'o' preceded by a vowel?

Question

Do we add 's' or 'es'? Please give me some examples.

Answer 1

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It is sometimes not easy to tell whether we need "s" or "es". The plural of most nouns ending in o is formed by adding s.

Video and radio are two words that have a vowel before the "o". The correct plural forms are "videos" and "radios".

Answer 2

In Latin, it would be a -t in the present tense. I don't know what language your asking about. Trying to think of another language with verbs (in first person singular present active indicative) that end in 'o'......
vocat-he calls
nuntiat- he announces
agit-he leads

(There is the English "to go" which, in the third person present, ends in "es")

Answer 3

Give me an example of a third person singular with verb ending in 'o' preceded by a vowel, and I'll tell you.
Examples of verbs ending in 'o' not preceded by a vowel:

He does.
She goes.