"Fun" isn't a noun so you don't use "a". You could say "Watching TV is a fun thing to do" - then "a" is because of the noun "thing" not the adjective "fun". You could also say "Watching TV is a pleasurable thing to do" - here "pleasurable" is an adjective, as opposed to the noun "a pleasure".
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AnonymousWhy don't you write "Watching TV is a fun"?There is no knowing why no article is used. People have just said it without an article for ages. Many linguistic phenomena are inexplicable, and that is true about other languages than English as well.
Anonymous-Hi, Cool Breeze. I see very well. But There is one thing I'd like to know.I don't have the vaguest idea. I never think in terms of concrete and abstract
"Pleasure" and "A pleasure" in A is different in the degree of abstraction. Pleasure is rather abstractive, and A pleasure is concrete.
Then, is the word "fun" concrete?