David said, “Robots can never replace human beings.”
⇒ David said that robots could never replace human beings.
David said, “Robots can never replace human beings.”
⇒ David said that robots could never replace human beings.
Lùi thì: "can" → "could".
Dịch: David nói rằng robot không bao giờ có thể thay thế con người.