Jolly old St. Nick will deliver presents to all the good girls and boys.
For instance, Participant 1 writes #1 Subject Noun, and changes the subject noun; Participant 2 writes #2 Direct Object Noun, and changes the direct object noun, etc.
You are free to make as many changes as you wish. Just remember to number each change (and indicate the part of speech) so it is clear to everyone where we are on the list.
When all 7 changes have been made, return to the top of the list and continue.
1. subject noun
2. direct object noun
3. indirect object noun
6. verb name
7. verb tense