The book costs Li Ming 10 yuan(cost为什么加s)

The book costs Li Ming 10 yuan(cost为什么加s) The book cost him 10 yuan可不可以用costs this coat cost him100 yuan.cost为什么不是costs?感激不尽 the book cost me 10 yuan （改为同一句） the dictionary costs me 30 yuan为什么用costs呢 英语中cost的用法问题：the book cost me twelve yuan 为什么主语是第三人称单数,cost不 The book cost her three pounds and twenty pence.为什么pound加s 而 The bike cost me 100yuan .中的COST不用加S? The book costs him 50 yuan.(保持原意不变) The book cost me 10$.cost要家s吗? living costs与the cost of living一样吗?cost是可数吗,后面可以加s吗? a smile costs nothing,but gives so much 为什么cost要加s?先不看give加s