the best approach is the historical one.
to understand how things are, it is often helpful and sometimes essential to know how they got to be that way.

에서 are을 쓰고 보어가 왜 없나요 ? 그리고 왜 굳이 콤마를 쓰고 it is를 쓰는지.....
여기에서 it은 뭘 가리키는 건가요 ??