I'm Chinese, and I am currently looking for an English teacher for my girlfriend. My goal is to train her speaking skill, which means I want to make sure she can open her mouth and speak the language. The thing is that she's too shy, and if the instructor knows Chinese, then she won't be able to speak English with the teacher. My goal is that the whole lesson is going to be taught in English, no matter how low her level is, and everything should be explained in English, just treat her like a baby. This can be called a natural language learning process. I want to do this kind of experiment or trial to see how it works. Anyone wants to give a try?