This strategy to select potential foci has a few exceptions to avoid foci that yield meaningless interpretations.
we discard potential foci: • whose root has dependency aux, auxpass, cop, poss, dep, prt or punct; • that consist of -the determiner the, a, an, it and there; -the adverbs so, too, though, even, still, as, quite, either, however, anymore, moreover, therefore, furthermore, hence, thus, further, apparently, clearly, specifically, actually, fortunately, and unfortunately; -a single token with part-of-speech tag TO, CC, UH, POS or IN.