answer: #Person2# uses the typewriter at night and #Person2# has early class tomorrow morning. #Person2# asks #Person1# to go to bed.
documents: #Person1#: You're going to wear out that typewriter.
  #Person2#: Oh, hi. What are you doing here at this time of night?
  #Person1#: I should ask you that question. Do you have any idea what time it is?
  #Person2#: About ten or ten-thirty?
  #Person1#: It's nearly midnight.
  #Person2#: Really? I didn't have any idea it was so late.
  #Person1#: Don't you have an early class tomorrow morning?
  #Person2#: Yes, at seven o'clock. My part-time class, for the students who go to work right after their lesson.
  #Person1#: Then you ought to go to bed.
  #Person2#: Ok.