Get them to draw a diary and fill it in for next week with lots of activities (sport & cultural). Then either put them in pairs or small groups or simple work together if the class is not too big – choose one person to be questioned (student 2):
Student 1: What are you doing on Saturday afternoon?
Student 2: I’m playing tennis with my sister.
Student 3: What if it rains, what’ll you do then?
Student 2: Oh.., we’ll go to the cinema.
Student 4: What if the cinema is closed, what’ll you do then?
Student 2: Oh.., we’ll go home and play video games?
Student 5: What if there’s a power cut, what’ll you do then?
etc, etc, etc
My students have always loved this game and you’d be surprised at what they invent!!