"Hamjala machungwa"

Translation: You have not eaten oranges

[greghuntoon]

"You all have not eaten oranges," should work as well.

[Joris215811]

I had the same, but that is probably a beta error, so I reported it

[BBazzle]

Accepted may 2019

[Kole-Wright]

I read in a grammar book that -ja- can be roughly translated as "not yet", but when I tried "You haven't yet eaten oranges", it was rejected. Am I wrong here, or should this be reported?

[ChrisVickio]

It's better to think of -ja- as "haven't". The word "bado" is used to provide the emphasis that "yet" does in your sentence, so I think it was right to reject it.

[Gazelle1596]

No, "not yet" is completely right - the -ja- tense ALWAYS :) implies that the possibility (or even intention) for it to still happen exists. Therefore it should definitely not be marked wrong.
Report it (I am.).