Questions & Answers about Mi trovis unu ekzempleron.
Because mi is the subject of the sentence: the person doing the action.
- mi = I
- min = me
In Mi trovis unu ekzempleron, I am the one who found something, so mi is correct.
Compare:
- Mi trovis lin. = I found him.
- Li trovis min. = He found me.
The -n ending marks the object, not the subject.
-is is the Esperanto ending for the past tense.
So:
- trovi = to find
- trovas = find / am finding
- trovis = found
- trovos = will find
A very useful point: Esperanto verbs do not change for person.
- mi trovis = I found
- vi trovis = you found
- li trovis = he found
The verb ending stays the same.