The audio doesn't sound interrogative. The intonation goes down at the end.
What is the difference between; dych chi, wyt ti, and rwdych chi? And what does 'n mean after chi/ti?
Why is "Dych chi'n mewn drama?" wrong?
yn comes before a verb(noun), a noun, or an adjective -- but not before a prepositional phrase such as mewn drama, yng Nghaerdydd, o flaen y ffenest, ....
how do I know if it's "a play" or "the play"?
Because it says mewn drama and not yn y ddrama.
I love that theatre life is covered so early in this language program