sentence: First , I must say that I do n't consider that my family members are my best friends , not only because they have other problems to care about , but also because I do n't know how to tell them my problems .
modified: Firstly , I must say that I do n't consider that my family members are my best friends , not only because they have other problems to care about but also because I do n't know how to tell them my problems .
transformation: MORPH, PUNCT