I use these 4 posters in the corner of my room. Regularly I ask questions that have the students reflecting on their opinion. They go to the appropriate corner (agree, disagree, strongly agree, strongly disagree) and briefly discuss with the other people their position (in French if possible).
Sometimes I have them match with someone from a different viewpoint to continue the discussion.
Questions generally start off light-hearted and increasingly become more thought provoking depending on maturity level.
Can be used across all grade levels!
*resource is in french