I see four indefinite articles and no underlining. They all modify singular countable nouns (though 'ration' should be 'rating', I suppose), just as they should.
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soheil1What happens if I replace the underlined 'A' with 'The'? The separate WGM title[...].It would seem a little 'off' to me, because the reader doesn't know that title exists.
soheil1So, is the use of 'a' just because the reader doesn't know about it?Or there could be more than one such title.
soheil1Do they use 'a' whenever the user is unaware of it?Usually, that is the way we introduce a new noun, yes.
Mister Micawber soheil1So, is the use of 'a' just because the reader doesn't know about it?Or there could be more than one such title.No there is just one.
Mister Micawber soheil1What happens if I replace the underlined 'A' with 'The'? The separate WGM title[...].It would seem a little 'off' to me, because the reader doesn't know that title exists.but you can say