The rules are simple. No 5 words limitation. You finish off the sentence of the player before you and start a new sentence to be completed by the player after you.
Eg:
Once upon a time, there..........
(First player)
....lived a cowherd named Ling. He was married with .......
(Second player)
....three kids. He had ten cows .......
(Third player)
....and two chickens. In the morning he.....
(fourth player)
and so on. Very simple game which allows you to stretch your imaginations to the limit. Short sentences, long ones, your call. I suppose the usual rules apply, er....like elsewhere.