I saw a comment on instagram that said
We're extremely worried about thr natural disasters that have been happening in Japan. We as in who are a part of the entertainment industry in Japan."
What's the purpose of having indefinite article "a" before "part" in the second sentence?
Will it be grammatically wrong if it was "...who are part of..."?
I understand the difference of use of indefinite and definite articles but I do not understand when I do not need any articles.
When do you not have to use articles before nouns? (other than uncountable nouns, I know that for words like "water" does not need an article)