Okay i will demonstrate how to do this here. Players write out their three word sentence or small phrase (if you will) by following the previous sentence in the story. Each person replies once until another player takes their turn. The only challenge is to use your imagination.
First example lets say,
Player 1:"There was chaos..."
Player 2: "in the darkest"
Player 3: "part of Yggdrasil..."
So on and so forth. Players can end chapters and start another round of continue the story.