I've seen lots of debate over whether or not some statements have the ability to strengthen or weaken arguments. The general consensus seems to be that they cannot strengthen or weaken, however, I came across prep test 29, section 1, question 16 on Proto-Indo-European languages where the correct answer to this weakening question was answer choice B, which was a some statement. I'm not sure if we can post questions in their entirety so I'll just say what the answer choice states and hope anyone with this full question and some good insight can reply "Some languages lack words for prominent elements of the environments of their speakers." My analysis is that while this may be true why does it have to apply to the group referred to in the stimulus? It could just as easily not apply to the group referred to in the stimulus, in which case it would not weaken the argument. Why should I have to make the assumption that the answer choice applies to the group referred to in the stimulus? If anyone can clarify for me it would be greatly appreciated. Thanks.
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TL;DR: "Some" is not always a reason to eliminate AC's, but inclusions of this kind of modifier might be a given AC's Achilles' heel.