1. Expressing Intensity or Degree:
* It was so cold, I could see my breath. (Emphasis on coldness)
* She's so talented, it's unbelievable. (Emphasis on talent)
* The music was so loud, it made my ears hurt. (Emphasis on volume)
2. Expressing Agreement or Confirmation:
* "Are you coming to the party?" "So am I." (Confirmation)
* "I'm tired." "So am I." (Agreement)
* "That's a great idea!" "So it is." (Agreement)
3. Introducing a Consequence or Result:
* The sun was shining, so I went for a walk. (Cause and effect)
* It's a big house, so it must be expensive. (Logical deduction)
* He was tired, so he went to bed early. (Cause and effect)
4. Expressing Purpose or Reason:
* I'm going to the store, so I can buy some milk. (Purpose)
* I'm working hard, so I can get a promotion. (Reason)
* She's studying hard, so she can pass the exam. (Purpose)
5. As a substitute for "very much" or "extremely":
* I'm so happy to see you!
* I was so excited about the trip.
* The movie was so boring, I fell asleep.
6. In a set phrase like "So far":
* So far, everything is going according to plan.
* So far, I've enjoyed my time here.
7. In conjunction with "as":
* So as not to be late, I left early.
* So as to avoid any misunderstandings, I wrote down the instructions.
Remember that the meaning of "so" can change depending on the context of the sentence.