sentence: Besides its advantages , which are that it is cheap and fast , there are many disadvantages to taking a bus or train , such as time , quality of service , and overcrowding .
modified: Besides its advantages are cheap and fast there are many disadvantages of taking bus or train such as time , quality of serving , and crowdedness .
transformation: OTHER, VERB:SVA, PUNCT, PREP, DET, PUNCT, MORPH, NOUN