sentence: On the other hand , traffic is the biggest problem when talking about transport , the car 's conveniences are replaced by the need for punctuality and , depending on the city , delays are a concerning point when we talk about travelling by bus or train .
modified: By the other hand , traffic is the biggest trouble talking about transport , cars facilities are replaced by the need of punctuality and , depending on the city , the delays are a concerning point when we talk about travelling by bus or trains .
transformation: PREP, OTHER, DET, NOUN:POSS, NOUN, PREP, DET, NOUN:NUM