问题描述：
6Mr .Brown always came back to work very late .At that time his wife and child has already got to sleep .To avoid waking them up ,he often used his key to open the door and step in quietly .One evening ,when he came back he found his keyswere left in the office .however ,he had to press the doorbell ,but it was no response .he pressed again ,and no response again .Mr .Brown had to knocked at the window of the bedroom and shout ,but still no response .Finally he was stopped and thought for amoment .Then he said in childish voice ,"Mum ,you have to pee !"He spoke very softly and Mrs .Brown woke up at once .
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