"You all are American."
shouldn't you be able to say "dou" too? (ni men shi dou mei guo ren) Because it says you ALL are American
I think duo translates 'nimen' as you all, when in fact it is just the plural version of you. Naturally when you reverse translate you all you get 'nimendou'
I agree. Duo makes it hard to know when it expects 娜 to specify you ALL instead of just YOU plural. It's annoying : /