sentence: I do a lot of sports , for example , cycling , karting , football and basketball but my favourite sport is swimming because I have been doing this sport with my grandfather since 1995 .
modified: I do a lot of sports for example : cycling , karting , football and basketball but my favourite sport is swimming because I have done this sport since 1995 with my grandfather .
transformation: PUNCT, PUNCT, VERB:TENSE, WO