Time: 5 to 10 minutes.
This game is good to revise and practise structures in the first conditional. Sit the students in a circle and then begin the game with a sentence; for example: “If I go out tonight, I’ll go to the cinema.” The next student in the circle must use the end of the previous sentence to begin his or her own sentence; e.g., “If I go to the cinema, I’ll watch Charlie and the Chocolate Factory.” The next student then could say, “If I watch Charlie and the Chocolate Factory, I’ll eat lots of chocolate.” Then, the other continues with “If I eat lots of chocolate, I’ll put on weight” etc. The first student who gets 'stuck' and cannot carry on is considered 'out of the game'. The game continues for any amount of time that you consider suitable.
You could use this same game without the 'elimination' process, just for the fun of it. Some zany ideas usually sprout from some clever students. (You could feel tempted to give some kind of reward to those, though).