-맛있어요.

it's delicious. => It's yummy. =>Your sentence has a correct grammatical structure, but this has the correct usage/expression.​

-더 먹을 래?

Would you like to eat more? => Do you want some more? =>Your sentence has a correct grammatical structure, but this has the correct usage/expression.​

-아니, 됐어요. 배 불러요.

No, it’s okay, I’m full. => No, thank you. I'm full. =>Your sentence has a correct grammatical structure, but this has the correct usage/expression.​​