sentence: Moreover , in large crowded cities , using the underground or buses is usually a good way to avoid traffic jams , saving time and stress for sad drivers during their commutes .
modified: Moreover , large crowded cities using underground or bus are usually a good way to avoid traffic jams , saving time and stress of sad drivers during commutations .
transformation: PREP, PUNCT, DET, NOUN:NUM, VERB:SVA, PREP, DET, MORPH