sentence: In my opinion , it is very important to speak several languages , not only for the above reasons , but also to train your brain , to have the opportunity to find a job abroad and , why not
modified: In my opinion it is very important to speak several languages not only for above reasons but also to train brain , to have the opportunity to find a job abroad and , why not ?
transformation: PUNCT, PUNCT, DET, PUNCT, DET, PUNCT