Thanks

Hi Heidi, I wouldn't say that this sentence is wrong, because grammatically it is correct but because you have two clauses, one with should and the other with will it seems a bit strange. I would stick to the first conditional with the structure: if + present simple, modal + infinitive. For example, if we eat snacks during the break, we won't be hungry for lunch at school.

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It’s kind of an awkward sentence. Personally I would phrase it more like this. We shouldn’t eat too many snacks during the break or we wont be hungry at lunch. or you can also say We shouldn’t eat snacks during the break or we wont be hungry when class gets out for lunch.