为什么是rising living costs不是raising living costs

为什么是rising living costs不是raising living costs rising living costs are considered by almost everyone as a r living in cities costs too much.为什么说这句话的主语是动名词?明明是living in 生活费可不可以说the living costs? the costs of living?the cost of living? living costs与the cost of living一样吗?cost是可数吗,后面可以加s吗? we are faced with the same problem of rising costs.rising 是名 求COST的用法?完整点的有没有the living costs这种说法？ 请问为什么是the rising sun而不是raising sun? this coat cost him100 yuan.cost为什么不是costs?感激不尽 the dictionary costs me 30 yuan为什么用costs呢 living