@Francesmg3 these drills are testing your ability to extract the pure logic from Sufficient & Necessary sentences.
While the LSAT is not a test of memorization, there are certain concepts you will need to know like the back of your hand, such as the keyword indicators of Sufficient & Necessary conditions.
The S & N keyword here is "unless" and here is a blog post on how to diagram it:
https://testmaxprep.com/the-unless-statement
The imperfection of the English language allows LSAC to write the same logical statement in a number of different ways. But if you can extract the pure logic, 2 + 2 is always 4.
Hope this helps! For a more in-depth discussion of this concept, please watch our video lesson on Sufficient & Necessary Conditions.
