Once students can do a chain improvisation, they really only need one more thing to make their scenes effective, a good way of finishing up and resolving the conflicts they've established.  A good way of teaching students how to do this is to give them a set of end-line improvisations. End-line improvs are just like beginning line improvs, except that the student is given the final line rather than the initial line.  Remind students that their characters still must have strong motivations, that THERE MUST BE A CONFLICT, and that complications make the scene more interesting.  With the "end line" to shoot at for a conclusion, students almost always figure out how to resolve their scenes. The following are useful end-lines: a. I'm sure glad I voted. b. Not with a bang, but with a whimper. c. All's fair in love and war. d. In a tomb in Egypt. e. Toto, I don't think we're in Kansas anymore. f.  I love you.