First of all, teacher need to enter Files for marking
During marking, teacher can press Pen icon on right to replay student's answer(see top orange circle). When teacher think student's answer is outstanding, press Good Work icon from toolbar at the bottom.(see bottom orange circle)
Teacher can write down your comment, choose share for current group or whole school, and post to news, then press OK on right top corner
Create good work record successful.。
Good Work will also display comment from teacher.
If teacher post Good Work choose post to News as well, teachers and student also can view it from News to quick review Good Work.