Sir
you have goo skills in TC. I see.
However, in my humble opinion, students tend to rely too heavily in the positive and negative words. This is a good strategy, though. Nothing to say on that oor that it is wrong. Of course. Not in my intention.
However, if you see my explanation above I think the best way is
1) using multiple strategies, it depends a lot on the context and the sentence we are dealing with
2) The meaning of the sentence is always our hallmark when we are solving a problem: both quant and verbal
I mean: using the + and - way of thinking is too narrow and you loose the big picture.
please see my explanation above and if still you are in trouble please do not hesitate to ask once again. I will help you without any concern