Why is this relevant to the test?

did I miss something? What is the missing rule?

@NoraElkhyati always thing about set and super set. also helps to think that sufficient (set) guarantees something to happen. But the necessary condition(super set) does not guarantee. example if it is raining, then the ground is wet.

you see the rains is sufficient and guarantee that the ground is wet but the ground being wet is not guarantee that it is raining. Could be wet for any other reason.

Hope this help

@ShanR Negate sufficient both ideas are correct as well. Remember that one idea is the contrapositive of the other one. the last example in negate sufficient was just to explain how we can read the sentence wrong if we don't do this analysis.

@adzballroom The translation rule said that what ever follow after the conditional indicator is the sufficient condition, that is the rule

@KirinTor Tha

@KirinTor can you explain question number 4. Please