Translation:This patient does not need help, he is already healthy.
Duo rejected "This patient needs no help, he's already healthy" - more compact English, but maybe too inexact a translation?
"he is already healthy" is something I have never heard spoken
"he is now healthy" is however a commonplace utterance
Well, 'care' is 'opieka', so 'nie potrzebuje opieki'. Generally makes sense, but that's not a translation of Polish.
Well, there is no "no longer" part in the Polish sentence, even if your sentence is perfectly logical.
I answered, 'this patient does not need help, he is healthy now' please explain why isn't my answer acceptable ... thank you very much for your help.
Your answer is a translation of "...on jest teraz zdrowy." (Here, już = already is needed.)
In general, in Polish – like in German – with the exception of those connected with conjunctions: "albo", "lub", "czy", "bądź", "i", "oraz" and "ani" all subclauses should be divided by comma, especially all dependant clauses, AFAIR. But that is just a raw approximation of the actual rules – I was never a whiz in interpunction and the comma rules I remember as particularly complicated from school. ;-)
It's not that common, but it's sometimes used. Basically it's a separator in strength between a dot and a comma. Used, for example, when there are already some weaker commas and a dot would be too much.
It is, but semicolon is considered a stronger divider than comma, I think – anyway, that is "advanced" interpunction, way beyond my knowledge(i.e. I have no idea where it actually should be used in Polish). ;-)
I do not understand why "does not need any help" is refused, the meaning is exactly the same
I believe that there are other sentences where any is accepted, even though there is no żaden in the Polish sentence. It seems to me that there is no exact equivalent to any, since żaden is stronger, thus closer to any... whatsoever. I would be in favour of accepting it here.