1. too, adverb

• excessive, more than (a negtive way of thinking)
  • there is too much
• very (positive, with smiley)
  • you are too kind
• as well (in addition, additionally)
  • He likes cake and I like it too

2. so, adverb/conjunction

• extent (how much)
  • she moved so quietly nobody noticed.
• extremely (emphasis), like too, excessive
  • the soup was so hot I had to leave it and and eat it an hour later.
• conjunction, therefore/thus
  • I wasn't feeling well, so I had to go to the doctor.
• truth, think
  • I think so.