YOU SAID:

if i eat sandwich tomorrow and don't eat hamburger i cannot

INTO JAPANESE

明日サンドイッチを食べて、ハンバーガーを食べないなら、私はできない

BACK INTO ENGLISH

If I don't eat sandwiches and hamburgers tomorrow, I can't.

INTO JAPANESE

明日サンドイッチやハンバーガーを食べなければ食べられない。

BACK INTO ENGLISH

If you don't eat sandwiches and hamburgers tomorrow, you won't be able to eat them.

INTO JAPANESE

明日サンドイッチやハンバーガーを食べないと食べられない。

BACK INTO ENGLISH

If you don't eat sandwiches and hamburgers tomorrow, you won't be able to eat them.