fish作"鱼肉"是不可数名词,无复数.
作"鱼"讲时是单复同形.两条鱼就是two fish.
作"鱼的种类"讲是有复数形式fishes.如There are different kinds of fishes in the river.
fish作动词用就是"钓鱼,捕鱼"的意思,直接用啊,如I don't know how to fish.单三形式加es.另外要注意的是跟在go后面用动名词形式,go fishing,去钓鱼.
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