Why is uskyldige correct here?
I think both plural and singular works with 'ingen' in some cases.
Is there a case where uskyldig would be considered incorrect in this sentence? I'm pretty sure it corrected my answer (although it gave me the point) when i left the "e" off when I had to translate from English.
Shouldn't it be 'are' rather than 'is'?
No, but don't feel bad, it's a frequent mistake. :-) None = not one, therefore, "Not one (of us) is innocent."