当“火”讲,不可数名词 例如：Do you know horses are afraid of fire? 你知道马怕火吗? 当“炉火;篝火”为可数名词 例如：The old men sat round the fire chatting. 老人们围坐在炉火旁聊天. 当“火灾”讲既可以可数也可以不可数 In case of fire ring the bell.（不可数） 万一起火,请按铃. A forest fire left hundreds of people homeless.（可数) 一场森林大火使数百人无家可归.
