她想吃鱼英文

fish在这里不需要加es.指的是鱼，整体He likes eating fish.

She likes to eat fish 就这么简单说

She wants to eat fish.提问: What does she want to eat?否定句She doesn't want to eat fish疑问句:Does she want to eat fish？Yes, she does.No, she doesn't.

He wanted to eat some fish lunch.

She like eating fish.

He would like some fish for lunch.首先“想”最好用would like 而不是want。比如通常点餐是侍应生也都是用What would you like，sir？表示你想吃点什么或是你想喝点什么？此外，some的用法并不拘于其后面所跟的名词的单复数格。

He wants to have fish for lunch.注意，别用some修饰，fish 是单复数同形，那样的话又要区分是否不同的鱼，因为这时候就得用fishes.

不加，fish当鱼肉讲是不可数名词。