what are advantages and disadvantages of group work in language learning?

what are advantages and disadvantages of group work in language learning?分组对于学习语言有什么好处和坏处？
回答：
advantages:you can learn more from others,have enough change to speak out.
好处：你可以从别人那学到更多东西，而且有足够的机会锻炼口语
disadvantages：you'd better listen to others if you just learning,there are too less friends in group,you can't listen more.
坏处：如果你刚学，你就要多听，而分组的人数少，你听的就不多．

分组作业在语言学习中的优点和缺点是什么呢？