What SINGLE verb means 'to make or turn positive (something)'? Urbandictionary.com contains positify, but I prefer a verb accepted by a worthy dictionary like the OED.
I seek only 1 SINGLE verb; please exclude phrasal verbs or verb phrases.
Also, what of 'to make or turn something negative'? The transitive verb 'negative' doesn't mean this; it has 2 different definitions (first, to reject'; second, 'to neutralise').
Some sample sentences of my own:
1. I wish to learn how to make positive clauses of negative polarity.
2. How can we make negative comments (or experiences) positive?