answer: #Person1# says #Person2# looks tired. #Person2# explains that's because #Person2# has been studying English and worried about it. #Person1#, as an American, encourages #Person2#.
documents: #Person1#: It seems you've burned yourself out.
  #Person2#: Pardon. I'm afraid I didn't quite catch you.
  #Person1#: You look tired. You must have overworked yourself.
  #Person2#: Yes, a little bit. I've been hitting the books all these days.
  #Person1#: Why have you been studying so hard?
  #Person2#: I need to review my English.
  #Person1#: So that's what keeps you so busy recently!
  #Person2#: Yes, I've been tied up with my studies. Now, what worries me a lot is my English.
  #Person1#: But why? Your English is very good.
  #Person2#: Thank you. You are very kind.
  #Person1#: No, I'm telling the truth. As an American, I understand you quite well.
  #Person2#: It's very kind of you to say so.