"negative" would have to be construed to include statements with a limiting intent. The sentence does not have to be strictly grammatically negative. For example, "As yet, only three people have joined" or "It works through an as yet obscure mechanism".
New words, one handy idiom, and a 2-minute quiz — delivered to your inbox to keep your streak alive.
Anonymous"So far/As yet (i.e.: still) we have 100 lbs. of flour in the storeroom, which should last till the next supply ship comes."For me, this isn't a natural use of either "so far" or "as yet".