Hi :D

When you use 'so' and 'very' to express the extent or size of something, (表示程度）
e.g. The mountain is very big. OR
The mountain is so big.
They mean the same thing.　

However, 'so' also has other meanings.
It is used to refer back to something that has already been mentioned.
e.g. So, that was the book you read? (Here it means, 那麼)
It can mean, the reason for something.
e.g. He was sick, so I went to see him (因此)

I hope it makes more sense now.

Thank you for correcting my English and teach me the differences of them!!

'So' can be used when someone ask you about the prdgression of your work or study.

How is your study?
So far so good.
OR
How is your work?
So so.....

Thank you!!
I could understund. :D

so
1. in the way or manner indicated, described, or implied: Do it so.
2. in that or this manner or fashion; thus: So it turned out.
3. in the aforesaid state or condition: It is broken and has long been so.
4. to the extent or degree indicated or suggested: Do not walk so fast.
5. Informal. very or extremely: I'm so sad.
6. very greatly: My head aches so!
7. (used before an adverb or an adverbial clause and fol. by as) to such a degree or extent: so far as I know.
8. having the purpose of: a speech so commemorating the victory.
9. for this or that reason; hence; therefore: She is ill, and so cannot come to the party.
10. (used as an affirmative to emphasize or confirm a previous statement) most certainly: I said I would come, and so I will.
11. (used as an emphatic affirmative to contradict a previous statement) indeed; truly; too: I was so at the party!
12. likewise or correspondingly; also; too: If he is going, then so am I.
13. in such manner as to follow or result from: As he learned, so did he teach.
14. in the way that follows; in this way: The audience was seated, and so the famous speech began.
15. in the way that precedes; in that way: So ended the speech, and the listeners arose and cheered.
16. in such way as to end in: So live your life that old age will bring you no regrets.
17. then; subsequently: and so to bed.
–conjunction 18. in order that (often fol. by that): Check carefully, so any mistakes will be caught.
19. with the result that (often fol. by that): He checked carefully, so that the mistakes were caught.
20. on the condition that; if.
–pronoun 21. such as has been stated: to be good and stay so.
22. something that is about or near the persons or things in question, as in number or amount: Of the original twelve, five or so remain.

とても very

Hi Tokiwaさん! It's nice to ask questions, that way you can learn more ^^.