please tell me the contest of using....

Hello friends, I would be thankful, if someone can tell me where we can use exactly "So Far". As far as my knowledge is concerned, it means "till this moment". But i happend to read it somewhere recently, that it could be used only in negative sentenses, Please clarify me only if you are clear on this.

Hi Jana, 

There is no rule to forbid  using "so far" in other sentences.  You can use it in both positive and negative sentences.

• So far, I have been to Europe and North America.  I will visit Asia in the future.
• So far, they haven't called to confirm their appointment.
• Sarah has had three jobs this year, so far.  Let's see if she keeps this job.