这句话的 主语谓语等句子成分帮忙分析下
问题描述：
这句话的 主语谓语等句子成分帮忙分析下
for married mothers ,the time spent on child care increased to an average of 12.9 hours a week in 2009.
答
主干：the time increased to an average of 12.9 hours a weeek in 2009
spent on child care修饰主语“the time"