The water management model simulated how water would flow through today's Everglades if all the pumps, gates, and other water control devices had not never been built.
[Not never means at some time.]
The water management model simulated how water would flow through today's Everglades if all the pumps, gates, and other water control devices had never been built.
The water management model simulated how water would flow through today's Everglades if all the pumps, gates, and other water control devices had not been built.
--Norman Boucher, "Back to the Everglades," Technology Review (modified)
If you would like to negate more than one word, use a negative word for the first word you would like to negate and replace any remaining negative words with an indefinite pronoun beginning with any- or the adverb ever.
Because no one was never around to record nothing, the computer model's algorithms cannot be calibrated and verified against reality.
Because no one was ever around to record anything, the computer model's algorithms cannot be calibrated and verified against reality.
--Norman Boucher, "Back to the Everglades," Technology Review (modified)