sentence: When Alison knocked on her parents ' door she noticed that there were many people in her parents ' house , a man opened the front door .
modified: When alison knock on his parents door she noticed that there were many people in her parents house , a man open the front door .
transformation: ORTH, VERB:TENSE, DET, NOUN:POSS, NOUN:POSS, VERB:TENSE