answer: Tom's mother blames Tom for losing the umbrella and takes away his cellphone to make him focus on real-life and study.
documents: #Person1#: It's raining again. Tom, bring me the umbrella.
  #Person2#: Well, mom. I'm sorry to tell you that I left it on the bus.
  #Person1#: Again? Don't you know that umbrella is expensive? You always leave our umbrellas on the bus, don't you?
  #Person2#: I'm sorry, mom. I won't let it happen again.
  #Person1#: It's no use saying sorry. You should be more careful and remember to take the umbrella with you when you get off the bus next time, OK?
  #Person2#: OK. I won't lose anymore umbrellas, mom.
  #Person1#: Anyway, just give me your cellphone, then you won't focus on it and lose the umbrella. You are having trouble with your study because of your phone, too.
  #Person2#: OK, if you want.