You can create discussion groups for students and teachers of your choice, perhaps for a specific year’s English class. This will allow the members to discuss that particular topic. Go to:

Menu > Collaboration > Discussion

1. In the top right, click the Create Group button.
2. Add the group name, select the department and year.
3. Now you can add your members to the group.
4. Click save.

For more information, watch this timestamped video: