The PI response is not willing to say he never embarrassed a lot of friends. Because I myself have never learn English with a native English teacher before., teachers do not know what to ask.
At that time I did not dare say not sour answer embarrassing friends. I myself have never learned the language with native teachers before knowing what the teacher asks.
At that time, you can't say dare not answer sour be embarrassed in front of your friends. Because you never learned the language with native speakers before so I don't know what the teacher said.