YOU SAID:

if you are going to a concert tomorrow morning then you should not be eatng any food from strangers on the flight

INTO JAPANESE

明日の朝コンサートに行くなら、飛行機の中で見知らぬ人からの食べ物を食べてはいけません

BACK INTO ENGLISH

If you're going to a concert tomorrow morning, don't eat food from strangers on the plane

INTO JAPANESE

明日の朝コンサートに行くなら、飛行機の中で見知らぬ人からの食べ物を食べないでください

BACK INTO ENGLISH

If you're going to a concert tomorrow morning, don't eat food from strangers on the plane