I could eat a horse. 我饿极了. 为什么这里不用can呢?

为什么英文里面：I can eat a horse 翻译成中文后就变成了：我可以吃一头牛呢? 过去式I wish I could fly.这里为什么要用could?不用can? could you come with me,please?这里为什么用could 而不用can 呢? I guess I could come over.为什么用could不用can呢 Im so hungry .i could eat(n)horse.中文是什么? Paris sounds like a city that I could enjoy.为什么用could而不是can呢 一个很菜的问题,为什么Could I have a full one, Please?中用Could而不用Can? I wish I could fly in the sky,could 和can,为什么不用can,could 是can I'm going away for a long time.为什么这里going后面不用加to呢? I often help it--a bath. 为什么这里不用takes呢 My mother said I could do nothing except eat.为什么不用doing 这里为什么用could呢?You can buy as much as spaghetti as you could.