Student or Learner
I konw "Why is it so expensive" is correct
but "why is so expensive" is OK?
likes "what is your dream"
I don't konw it can be possible.
Last edited by BobK; 23-Dec-2014 at 13:07. Reason: Trivial typo fixed ;-)
The last sentence sounds very odd. One would normally meet 'I don't know if it's possible' or '...if it could be possible' - depending on the meaning.
***** NOT A TEACHER *****
No, the adverb "why" is not the subject.
In questions, the first word is not necessarily the subject.
When you parse (analyze) a question, it is necessary to mentally put it in regular order (subject + verb):
"It [subject] is [verb] so expensive."
Add the adverb at the end: "It is so expensive why."
Then put it in question form with the question mark: Why is it so expensive?
Part of learning English is the cultural aspect. Do you mind if I respectfully suggest that you might think about changing your member name? Here in the United States, some people might be offended by those three "c" words that you have chosen.