used in negative statement to describe a situation that has existed up to this point or up to the present time; "So far he hasn't called"; "the sun isn't up yet"
used after a superlative; "this is the best so far"; "the largest drug bust yet"
making an additional point; anyway; "I don't want to go to a restaurant; besides, we can't afford it"; "she couldn't shelter behind him all the time and in any case he wasn't always with her"