share with me i think that the good way to be professor anything, you should try to learn how to become a teacher about them. i am not also good at english, but i think my english is too bad and i can teach something what i know for other who is not better than me. one by one, i also know more knowledge about grammar, but i know grammar is not all in a language. it is a success in first step. And now I am trying to teach vietnamese which is my mother language for other by english. I know i can not speak too fluently and skillfully, I believe that i can do it. Therefore, we can exchange our mother language each other by english. This is the useful way for me.