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I'm working on the Justify the Conclusion and Assumption questions in the powerscore LR Bible and am having a hard time identifying the conditional reasoning in the stimulus (when it is present) and then working with the conditional reasoning in the answer choices. Does anyone have any quick conditional reasoning tips and/or some good material to drill and explain conditional reasoning further?

Basically, I what I'm having the hardest time with is determining what is the sufficient and necessary condition when no indicators exist (and linking them to form a conditional reasoning chain).

The Trainer or the Manhattan book on LR does a much better job in explaining how to attack conditional reasoning in general and Justify and Assumption questions. If you haven't read them, I recommend giving them a read.