sentence: To sum up , there are many issues that affect people 's lives and we do not know how they will change in the future , but we are sure that in 50 years from now there will be an important change as happened 50 years ago .
modified: To sum up , there are many issues that affects people 's lives and we do not know how it would change in the future , but we are sure that in 50 years from now it would be an important change as well as it happened these last 50 years ago .
transformation: VERB:SVA, PRON, VERB:TENSE, OTHER, VERB:TENSE, OTHER, PRON, OTHER