'Non-' is a negative prefix, so you have created double negatives. My only other comment is that your negations are not sentences that would be used in the real world.
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khoffthis is logically correct but not useful in daily language.On the other hand, it is probably not inappropriate to point out here that similar constructions are not infrequently encountered in nineteenth-century British novels.
Anonymous"I was not a little surprised." How do I make it affirmative?I was a little surprised.