sentences:  He liked it and agreed to produce the movie.Kanin was fighting in the war at the time, so the script was written by his brother, Michael Kanin, and mutual friend Ring Lardner, Jr. Hepburn contributed significantly to the script – reading it, suggesting cuts and word changes, and generally providing helpful enthusiasm for the project.As a part of the deal, Hepburn had the option of selecting her co-star and director (Tracy and Stevens).