Why not "Er du kommende"? According to hints.
For some reason the multi-part hints aren't working, but that sentence structure is wrong in Danish, the continuous can be given by the standard present tense (which is kommer here)
Kommende works as sort of an adjective. Er du kommende would mean something like, "Are you a coming person?" so it wouldn't work in this context.
I've also heard "Kommer du med?" which implies, I think, "Are you coming with us?"
Would that work as well for "Are you coming?"
As you say "kommer du med" means "Are you coming with us" and not "Are you coming". Med = with
Why is "Er du kommer" not correct?