"A person is not old until they let regrets take the place of their dreams."– John Barrymore

Lucas January 14, 2020

Please explain

Okay, so when I diagram these questions, I believe I'm doing it exactly as it's being asked, but I'm still getting it wrong. I did it this way Not O->RTPD. Please explain how to fix this.

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Lucas January 14, 2020

Or am I just looking for an answer choice that just assumes that if O-> RTPD. And is it this way for all questions like this? Because I understand that until, unless, only if, required, depends introduces necessary.

Irina February 25, 2020

@Lucas,

You are correct in that until introduces the necessary condition, but you also have to negate the other part of the statement to turn it into sufficient.
So in this case everything after until is necessary - "let regrets take part of their dreams," whereas the other half - "is not old" must be negated. "not old" negated becomes "old." Hence, the diagram is O -> RTPD