Only with context! As is seen in one comment, the pronoun is left out and just the 2 words would only say "[third person] did something". My Latin lessons were

Only with context! As is seen in one comment, the pronoun is left out and just the 2 words would only say "[third person] did something". My Latin lessons were very long ago, but yeah. You'd probably declare it once per paragraph, then shorten. But in isolation this information is lost.