I already know, and so ask NOT about, the meanings or proofs of: A unless B = A, except if B
= A if not B = Either A or B. I ask only for intuition; do NOT prove formally or use truth tables.
My problem: I want to avoid memorisation. So whenever I see unless, I always need to pause for 5 minutes to rewrite the sentence, in order to determine the meaning. This pause reveals deficiency in my knowledge, which I must resolve, because it smothers me.
So please help me dig deeper. How can this conjunction be naturalised?