Anonymous Once you get the sickness, you are prone to it for the rest of your life. " "Prone" describes a potential. You'd be talking about a recurrence of the sickness here, not about a situation in which "the sickness" never goes away.
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AnonymousOnce you get the sickness, you are prone to it for the rest of your life.I'd say "Once you have had the sickness, you are prone to it for the rest of your life."