formal logic with keywords

sally mhr

I need help diagramming statements (with contrapositives) with keywords like: some, most, few, many, none, no one. I am having troubles answering Must be True questions on LR section that has those keywords. And, do I always translate such statements in if/then format or is there instances when it is not applicable?

(example question that throw me off with these keywords is Q12, Section 2, PT23. How can they use "weak local government" as sufficient without negating it when the FL structure in stimulus makes it necessary? and if that is possible, why D is incorrect then compared to the correct answer B?)

Thank you!