sentence: But there are some disadvantages , like stairs because we are on the second floor . We would like to keep fit but we have to use too many stairs to reach our classroom and that 's so annoying sometimes .
modified: But there are some disadvantages like stairs because we are at the second floor . We would like to keep fit but we have to use too many strairs to reach our classroom and that 's so annoying sometimes .
transformation: PUNCT, PREP, SPELL