sentence: Even though our subway system is still developing , the main line that passes through downtown , several universities and popular city spots is very popular and has been many tourists ' , students ' and professionals ' first choice for commuting .
modified: Even though our subway system is still developing , the main line that pass through downtown , several universities and popular city spots is very popular and has been many tourist , students and professionals 's prior choice for commute .
transformation: VERB:SVA, NOUN:POSS, NOUN:POSS, NOUN:POSS, ADJ, VERB:FORM