this coat cost him100 yuan.cost为什么不是costs?感激不尽

this coat cost him100 yuan.cost为什么不是costs?感激不尽 the coat cost me 5 yuan.这是用cost还是用costs好?有没有判断的标准啊 Do you know how much this costs?其中为什么cost要加s?不是疑问句都要用原型吗? The book costs Li Ming 10 yuan(cost为什么加s) I bought this cap yesterday and it (cost) me 70 yuan中cost为什么 The book cost him 10 yuan可不可以用costs you can have it for what it cost me 为什么这儿不是costs.应该用cost呢 还是 our house cost us 60000 yuan.为何用cost而不用costs this new CD cost me (20yuan) I cost ten yuan for this book. It cost me 20 yuan.为什么用cost cost有没有单三形式?如The coat cost him 300 dollars.还是The coat costs