I can't finish this.我吃不完了。
I can't eat another bite. 我一口也吃不下了。
I really like dessert, but I can't eat it now, can I get it to go?我非常想吃甜点，但是现在吃不下了，我能带走吗？
Do you have a doggie bag?有打包带吗？
Do you have something I can put this into?有没有什么东西可以把这个放进去？
Could you put the leftovers in something, so I can take them home. 你能找个东西把剩下的菜放进去吗？这样我可以带走。

Dialogue:
A: I can't eat all of this, can you wrap up what's left to go?我吃不完了，你能把剩下的给我打包吗？
B: Certainly, I'll take care of that. 当然，我会帮你弄好的。