英语 Do you often spend your money on buy new books?这句话中,on后是否能加动词?

错了
spend…on /(in) doing sth
【on sth】或者【on doing sth】可以改成 Do you often spend your money on buying new books？ 这样对不可以或者直接on new bookson 和 in 都可以吗？ 或者把介词去掉，就留动词也行吧？总的来说spend sth on sthspend sth(in) doing sthon后面不用动词，直接接名词