sentence: It was already night when he was at Luck 's house ( Luck was an old friend ) and all of them were talking about life things , but then Luck remembered that John was working on an experiment and he did n't know what it was about , so he asked John in front of everyone :
modified: It was already night when he was in Luck 's house ( Luck was an old friend ) and all of them were talking about life things , but then Luck remembered that John was working in an experiment that he did n't know what was it about , so he asked John in front of everyone :
transformation: PREP, K, PREP, OTHER, WO