Here's how it works:
* "Es" indicates that the subject is he, she, or it.
* It is used with verbs that have a stem ending in "-er".
For example:
* Il parle. (He speaks.) - "Parle" is the verb stem "parl" + "e" for the third-person singular.
* Elle mange. (She eats.) - "Mange" is the verb stem "mang" + "e" for the third-person singular.
* Le chien dort. (The dog sleeps.) - "Dort" is the verb stem "dor" + "t" for the third-person singular.
Note: The "s" in "es" is silent, so you wouldn't hear it when spoken.
Let me know if you'd like to see more examples!