"No woman works here."
Translation:Żadna kobieta tu nie pracuje.
Double negatives are frowned upon in BBC English - but some English dialects happily translate the Polish sentence directly to "No woman b'ain't be working here!", or "No woman don't work here!" - or even "No women don't work here!" (breaking a further grammatical rule).
In most forms of English, negatives cancel out pairwise to give a positive, but Polish appears to love multiple negatives (maybe to ensure that hearers really get the negative point), so my rule of thumb (don't tell Jellei!) is to negate every possible word in my Polish translation of a single-negative English sentence. Sometimes I'm OTT, but I'm surprisingly often right.
EDIT: As luck would have it, just to confuse us, today's Polish lesson presented me with a Polish sentence that needs a single negative and is hopelessly messed up by any attempt at more:
"Ona nigdy nie zwiedza z przewodnikiem" –
"She never goes sightseeing with a guide". [28 Jan 2019]
Unless I'm forgetting something, double negative is generally a must everywhere if only it's possible.
For example if we translate "No woman works here" word-by word, we get "Żadna kobieta pracuje tutaj", and that's nonsense. So it's not like double negative emphasises something, it is just the only way.
Yes perhaps you are forgetting something because there is such a thing as a double-negative in the English language which is a big no-no for grammar in English. However in French and Spanish it's OK, it highlights that something is really bad. Thus why, as a non-native speaker I'm finding it difficult to wrap my head around it.
Jellei you stated that "if we translate "No woman works here" word-by word, we get "Żadna kobieta pracuje tutaj", and that's nonsense. " But I do not understand why it is nonsense. Why is it strange to Polish speakers? How would they interpret it? when to me it sounds fine and tells me that in this place there is no woman working.
To you it tells this and makes sense, because you think in English (or your native language if it's different). But really "Żadna kobieta pracuje tutaj" has no meaning. The double negative is a must. To compare, it makes about that much sense as "No woman does not work here".