This is a great activity in which your students have the chance to speak regarding a given subject and give arguments on what they say. It has many uses, personally, I used it with a specific topic we had previously talked about. Then I wrote some statements on the board and they had to discuss in pairs while using the expressions given in the bingo. Each time they used a expression, they covered it until they got the bingo line or a full board. If you have any other idea, please share it!