✔ 最佳答案
This question is very interesting, because the "very" in the sentence "this is so very good" is not used as an adjective. It is actually an adverb to further describe the adjective "good".
However, that is not a problem, because "so" in this sentence is also used as an "adverb", to further describe the adverb "very".
Therefore, the teacher is right. It is grammatically correct to say "this is so very good", and quite appropriately so, when one wishes to emphasize the point.
2010-09-21 12:10:20 補充:
"so very ....." is quite commonly used, to emphasize a point. See for youself by typing "so very" into a search engine.
Exampe:
"So far, so very good
The president-elect is proceeding with all deliberate speed"
http://www.economist.com/node/12689694?story_id=12689694