sentence: I 've never had any experience of this kind before , but I have a brother three years younger than me and a little cousin who 's seven years old with whom I usually play a lot when I do n't have to study .
modified: I 've never had any experience of this kind before , but I have a brother three years younger than me and a little cousin who 's seven years old with whom I use to play a lot when I do n't have to study .
transformation: MORPH, VERB:FORM