Grammar of "good on"
Here is the sentence: "We go to the cinema every now and then, but only if there's something good on"
My question is: I don't know why the author had to put the word "on" after "good". What is the purpose behind this?
Can someone please help me answer this question.
Thanks.
Solution 1:
As noted in the comments, the "on" refers to "on whatever media". I would usually associate "good on" more with television and "good playing" with cinema.