cost:物做主语 sth.cost sb + 时间/金钱例:The shirt costs me $100.这件衬衫花了我100美圆．spend:人做主语1) sb.spend + 时间/金钱 + on sth.例:I spend $100 on the shirt.2) sb.spend + 时间/金钱 + (in) doing ...