These comments must have been entered when it was wrong. It must have beem fixed, as it is absolutely right now.
This is why it is good practice to date comments...
totally right. only when it's in a question it should have the accent. duolingo makes many mistakes in this item
I think this is supposed to be an indirect question (or an answer to an indirect question), therefore cuándo (accent). But, I also think it stands equally well as a declarative sentence, therefore cuando (no accent).
this is an exception to the question rule... it has an accent if it comes after sé because it is the interrogative mood. I don't fully understand the grammar, just that it does have an accent after sé
no, conocer is to to be familiar with someone while saber is to know about something