Games to activate "just", "already" and "yet"

Hi
I would be happy to let me know your nice ideas regarding this matter. How do you usually activate them. I have lots of books concerning grammar games and I also surfed the net but mostly I've found some dull fill-in-the-gaps type of exercise or close-test. I'm looking for a challenging and exciting worksheet for the students to practice these structures and also have fun.
Thanks a billion.
PS. The learners are in upper-intermediate level and they're adults.