Why is "When do they go there?" wrong? Isn't "chodí" the same in 3rd person plural too?
I assume you mean chodit, which is “indefinite” (go regularly, go around or walk about), while jít means to go at a certain time, to some place or to come from somewhere. See https://forum.duolingo.com/comment/24559543. Some other comment tells me there is a more detailed explanation in the “Movement” lesson but it is still very far away for me.
I suspect it may never be accepted, but that's a guess. One of my textbooks describes chodit as a verb "that conveys habitual action." It goes on to say, "It is also used to express regular attendance at school or going regularly to church or to entertainments."
Having made this discovery, I'm thinking the sentence is asking "When does he go there," expecting as an answer something like "every Wednesday and Friday." I hope one of the CZ natives on the team will drop in to explain this better... :-)
I tried: When is she going there? but that was rejected. Is it really wrong?
What is the meaning with the continuous tense? I would expect rather "When does she go there?"
If you want to speak about future, than it is "Kdy tam půjde?" for a single occasion or "Kdy tam bude chodit?" for repeated attending in the future.