fish意为“鱼”时是可数名词,用how many,指种类其复数为fishes,指条数时复数为fish(此时单复同形);指“鱼肉”时为不可数名词,用how much.
how manyfish 做鱼讲是可数名词 单复数形式一样
如果指食物用how much fish只动物——鱼用how many fish
how much fish如果是fishes,表示鱼的种类时用how many
fish绝对不是单复同形当它作为鱼肉讲时,不可数当它作为鱼讲时,可数