sentence: The story is set in the future , about thirty years from now , when time travel has been invented but is used only by criminal organizations who send those they want killed into the past , where a professional killer , a looper , is waiting for them and for the silver strapped to their body .
modified: The story is set in the future , about thirty years from now , when time travel had been invented but was used only by criminal organizations who sent those they want killed in the past where a professional killer , a looper , was waiting for them and for the silver strapped to their body .
transformation: VERB:TENSE, VERB:TENSE, VERB:TENSE, PREP, PUNCT, VERB:TENSE