He boasted that he could eat a horse.

他吹牛说他可以吃下一匹马。

Of course.I can eat a horse now.

当然是了，我现在饿的能吞下一匹马。

Is dinner ready? I could eat a horse.

晚餐准备好了吗？我饿得能吃下一头牛。

And do you often find that you could eat a horse?

你经常发现你能吃下一头牛吗？

Or " I'm famished I could eat a horse" , combining a more extreme adjective with a nice idiomatic expression is fantastic.

或者“我饿得能吃下一头牛”，把一个更极端的形容词和一个很好的习惯表达结合在一起是很棒的。

Okay, but I could eat a horse right now.

史蒂夫：好吧，但我现在可以吃掉一匹马。