My warning was - You used the you form "Kennst" instead of the they form "Kennen".
I thought Sie was formal 'you'. God, 'you' has to be the hardest part of basic german by far.. it's so damn confusing!
"Kennen Sie uns?" is proper use but I'm not sure if duo accepts it.
It does accept it.
Lowercase "sie" is "they," but it can be capitalized at the beginning of a sentence. The formal you form of "Sie" is always capitalized.
"du kennst uns?" is wrong?
That would be "You know us?".
What about "versteht du uns"?
i already used this construction in other answers (questions) and it was correct
They were being generous.
They haven't taught us how to handle questions yet.
I read somewhere that in german the questions must always begin either with a verb or with question word (what, how, when, where, which...)
Proper German structure for questions is question word (Welche, wie, wo, etc.), verb, subject. In this case there is no question word, so it would be Kennst du uns?
When is uns used instead of unser?
uns = us (accusative)
unser = our
Why not "versteht du uns"?
Well becouse in this case the question is not understanding somebody but knowing it is the thing
Can we use ihr here in place of du?
You could but you have to conjugate the verb kennen properly: "Kennt ihr uns?"
(not sure if duo will accept it though...)
Why not Hast du kennst uns?
Why would "hast" be in there?
The verb "have" isn't in the English sentence, if it were, the sentence wouldn't make any sense. So why would it make sense in the German?
how would you say "do you (plural) know us?"
Informally - Kennt ihr uns?
Formally - Kennen Sie uns?
is kennst uns du correct??
No, that's incorrect word order.
why cannot i say
kennen ihr uns?