shone, shown

Shone is both the past tense and the past participle of shine, which means “emit light.” (Shine, of course, has many noun meanings as well, as in shoeshine or the shine made by those country boys.)

Shown is the past participle of the word show, which means “to cause to be seen.” Shown will form passive constructions like the movie was shown or perfect tenses like he has shown the movie.

Example: We were shown the spot where the old lighthouse had first shone its light on the harbor in the early 1800s.