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