So far, Until now, Up to now Hello Everyone My question is: Is it possible to use "So far" at the beginning of the phrase? for example: So far he has been working as a teacher; I don't know which way is more polite, could someone explain me which way is more polite or useful? (Up to now, Sor far or Until now) And is it possible to use all this expressions at the beginnig of the phrase or only at the end? Thanks