"Το να τρως στη βιβλιοθήκη απαγορεύεται."
Translation:Eating in the library is forbidden.
That sounds unnatural in English, but "It is forbidden to eat in the library" is correct.
"It is forbidden to eat in the library" is one of the accepted translations.
I wonder why my answer 'Eating is not allowed in the library' was marked wrong. The sense is exactly the same as 'prohibited'.
Sorry, we had 8 variations but forgot this one. This is a great example of how the community improves the course. Many thanks.
See here for some of the reasons we feel "ban" is not suitable for this sentence.