划分句子成分：For every hour they skate, each student raises ten yuan for charity.

前面半句是状语
each student主语
raise谓语
ten yuan宾语
for charity补语

each student 是主语， raises 是宾语，后面是宾语，For every hour they skate是状语

恕我孤陋寡闻，啥叫划分成分啊？