Task: Question Understanding
Input (English): Context : Semi-Tough is a 1977 American comedy film directed by Michael Ritchie, and stars Burt Reynolds, Kris Kristofferson, Jill Clayburgh, Robert Preston, Lotte Lenya and Bert Convy, set in the world of American professional football. 
Question : Which is the basis of Semi-Tough?
Output (English): based on