The working group that causes some students did not help until they were lazy. Therefore, the teacher must add activities that give students the same quality is matched by.
The working group that causes some students did not help that they are lazy. Therefore, teachers need to increase the activity of interest to the students together to do the work assigned by the couple.
Group work that causes some students didn't help until they are lazy. So I need to add interesting activities for students working together by the assigned a pair.