And whoever told you that your adult learners feel games were childish and mean that their time in an English language learning environment should be staid, when it comes to using games in the English language classroom with adults.
The language classroom is a great place to experiment with educational games. it's also true that adults and advanced learners enjoy competition and lighter.
Many learning games teach important skills and are useful classroom tools, but they aren't fun to play. I first seek out games that play well.
Including games in an English class with adult learners can be a difficult one. to make sure we choose the right ones for our audience and classroom set-up.
Adults learn best and are most receptive when they are comfortable with the people around them. Whether in a classroom or at a conference.