I spend 20 yuan to buy books every week

问题描述:

I spend 20 yuan to buy books every week
这句话对么?
还是应该改为I spend 20 yuan buying books every week
还有
I oftenfrom school with my friend
A go back homeB go back to home C go back at home
D go back in home
这话什么意思哈.

spend ...doing sth.固定句形
我经常和朋友一起放学回家.选A home前不能加介词