sentence: Why do we use public transport ? Some of us use it to save money by not buying gas or because they ca n't buy a car or if they have problems with their cars or they are n't in the mood to drive .
modified: why do use public transport some of us use it to save money for not buying gas or they ca n't buy a car or if they had problems in their cars or they do n't have the mood to drive .
transformation: ORTH, PRON, PUNCT, PREP, PREP, VERB:TENSE, PREP, VERB, OTHER