How do you know whether it is supposed to be 'you' plural or 'you' singular
Only just started Italian. Indeed, I am on the very first topic. It seems that I know more Italian than Duolingo. I translated "you eat" as "mangiano", which is perfectly correct. Duolingo marked me wrong and said I should have put "lui/lei mangia", which means "he/she eats"????
I have just tried again and use the pronoun "loro" so Duolingo wouldn't get confused. Although I am correct but Duolingo marked me wrong and insists on "tu mangi". It seems the developers of Italian on Duolingo don't understand Italian culture. It is extremely unlikely I will know another Italian speaker who I can address as "tu". "Lei" or "Loro" are what I will need if speaking Italian to anyone.
Duolingo is not that helpful. I know a language tutor who withdrew from Duolingo because they refuse to follow sound pedagogical principles and insist on teaching languages according to their own views rather than teaching them fully and correctly. I strongly recommend you do not use Duolingo as your sole means of learning any language.