(一).Help yourself.

尽情吃 随便用。

May I start eating breakfast?

我可以吃早饭了吗?

Help yourself. I have many kinds of food for you.

快吃吧，我给你准备了好多吃的。

(二).I am stuffed.

我吃饱了。

How would you like some ice cream?

你要再吃点儿冰激凌吗?

No, thank you. I am stuffed from the dinner.

不，谢谢。我晚饭吃得很饱。