One of my favorite discussion activities is an activity called 'What would happen if...' which I wrote about seven or eight years ago. This activity can be done successfully with upper intermediate to advanced students who want to practice and increase their fluency. This is also good for students who want to improve their ability to give opinions about all different types of topics. Students are given a scenario and they have three things they can come up with that 'could' happen. This can be used in a virtual classroom or a face-to-face classroom with a data projector set up. This can be taught utilizing small group, pair work or whole group discussion.