our house cost us 60000 yuan.为何用cost而不用costs

our house cost us 60000 yuan.为何用cost而不用costs The car cost him ten thousand US dollars为什么cost 不用costs this coat cost him100 yuan.cost为什么不是costs?感激不尽 the meat cost us 100 yuan.the fish cost us120 yuan.(合并为一句) t the meat cost us 100 yuan.the fish cost us120 yuan.(合并为一句)(一 1.the new house cost my family all the money为什么不用costs the house __yesterday cost him 8000yuan The book cost him 10 yuan可不可以用costs How much is your house ____ It`s30.000 yuan 为什么用worth 不用cost the coat cost me 5 yuan.这是用cost还是用costs好?有没有判断的标准啊 cost和costs的用法 The bike cost me 100yuan .中的COST不用加S?