e on fire表示一种状态
eg:Look!The house is on fire.
而catch a fire强调动作性
eg:The boy is so careless that he catches a fire on his clothes while cooking meals.
e on fire表示一种状态
eg:Look!The house is on fire.
而catch a fire强调动作性
eg:The boy is so careless that he catches a fire on his clothes while cooking meals.