Cut up into cards. Give out one at a time to students (big classes can do the exercise in groups). The rest of the class take it in turns to ask questions of the student with the card to find out their job. Student may only answer "yes/no" if a beginner or "Yes, I do/am/it does etc" if a little more advanced. Set a limit of 20 questions. Can also be used for advanced groups as a warm-up activity.