"This banana is expensive " doesn't work? Why?
Because "this banana" would need the definite article /al-/ on /muza/.
I see, like this:
"هٰذِهِ الموزة غالْية."
The arabic for banana sounds like "miuuza", in my dictionary I find مَوزة that should sound "mauuza". I am wrong?
this is expensive banana... this should be accepted. You put errors where it should be accepted