sentence: For instance , one day I was walking in the park when I saw a girl falling down from a children 's swing in the playing area . I helped her immediately , and after I was sure that she was fine , I called her mother and told her about this incident . She thanked me a lot .
modified: for instance , one day I was walking in the garden when I saw a girl falling down from a children swing in a playing area , I helped her immediately , after I was sure enough that she was fine , I called her mother and told her about this incident , she thanked me a lot .
transformation: ORTH, NOUN, NOUN:POSS, DET, PUNCT, CONJ, ADV, PUNCT