We use so with be and with modal and auxiliary verbs to mean ‘in the same way’, ‘as well’ or ‘too’. We use it in order to avoid repeating a verb, especially in short responses with pronoun subjects.
1. For that reason; therefore: This is the easiest way to get there, so don't argue. 2. With the result or consequence that: He failed to appear, so we went on without him. 3. With the purpose that: I stayed.
You use so when you are saying that something which has just been said about one person or thing is also true of another one. I enjoy Ann's company and so does Martin.
adverb in such a condition or manner, especially as expressed or implied “They're happy and I hope they will remain so ” “ so live your life that old age will bring no regrets” adverb in the way indicated.