Well, maybe I use the wrong words for expressing what I want to say.
I will tell you. It's right that I know someone but I don't know all things about him. Do you get?
For example, I know you. You are a teacher in Englishforum.com but I don't know who you are exactly. So anyone ask me about you, I will tell hime I only know you as a teacher in Englishforum.com. So when I translat