JAI (http://www.lojban.org/en/publications/reference_grammar/chapter9.html)

When followed by a tense or modal, creates a conversion operator attachable to a
selbri which exchanges the modal place with the x1 place of the selbri. When
alone, is a conversion operator exchanging the x1 place of the selbri (which
should be an abstract sumti) with one of the places of the abstracted-over bridi.

mi jai gau galfi le bitmu skari I am-the-actor-in modifying the wall color. I
act so as to modify the wall color. I change the color of the wall.

