Read the dictionary definition of so. All definitions for this word.
1. the syllable naming the fifth (dominant) note of any musical scale in solmization
2. in truth (often tends to intensify)
1. they said the car would break down and indeed it did
2. it is very cold indeed
3. was indeed grateful
4. indeed, the rain may still come
5. he did so do it!
3. (used to introduce a logical conclusion) from that fact or reason or as a result
1. therefore X must be true
2. the eggs were fresh and hence satisfactory
3. we were young and thence optimistic
4. it is late and thus we must go
5. the witness is biased and so cannot be trusted
4. subsequently or soon afterward (often used as sentence connectors)
1. then he left
2. go left first, then right
3. first came lightning, then thunder
4. we watched the late movie and then went to bed
5. and so home and to bed
5. in a manner that facilitates
1. he observed the snakes so he could describe their behavior
2. he stooped down so he could pick up his hat
6. in the way indicated
1. hold the brush so
2. set up the pieces thus
7. to a very great extent or degree
1. the idea is so obvious
2. never been so happy
3. I love you so
4. my head aches so!
8. (usually followed by `that') to an extent or degree as expressed
1. he was so tired he could hardly stand
2. so dirty that it smells
9. in such a condition or manner, especially as expressed or implied
1. They're happy and I hope they will remain so
2. so live your life that old age will bring no regrets
10. to a certain unspecified extent or degree
1. I can only go so far with this student
2. can do only so much in a day
11. in the same way; also
1. I was offended and so was he
2. worked hard and so did she