分类：教育/科学-外语学习
问题：帮忙分析一下Theycouldbreakdownthestruc 
They could break down the strture of students sitting in classroom in front of lecturers.其中"sitting"作什么成分？
回答：现在分词短语做定语,修饰students,因为students与sitting 之间是主动的关系,所以这里用现在分词.如果是被动的关系的话就要用过去分词.
students sitting in classroom 相当于一个定语从句,students who sit in classroom.