Is this show still running? Do they still make this show? For discontinued, you can say "has this show been cancelled?" "which channel is this show on" is fine.

Is the show still running/airing? Is the show still making new episodes?

1. I would like to know if we can say "is this show still on?" if we want to know if it is still on TV? 2. What if I wanted to say the opposite? Could I say "is this show discontinued?" 3. "Which channel is this show on?" 4. How could I organize these QUESTIONS? ----- #1. Yes, but "Is this show still on the air?" or "Is this show still playing?" would sound clearer. #2. "Has this show been canceled?" #3. Yes, good. #4. What do you mean by "organize these questions"? I numbered them 1, 2, 3, and 4 so I could refer to them.