Student or Learner
After lunch break, the students weredivided into three groups, during whichthey discussed what they should do to improve the cleanliness of the school.
Is the comma needed? Thanks.
"improve the cleanliness of the school. " sounds wordy and pretentious. "make the school cleaner" is better.
---NOT A TEACHER---
I'm not a teacher, but I write for a living. Please don't ask me about 2nd conditionals, but I'm a safe bet for what reads well in (American) English.