Question

Turn on the lights make negative sentence

Answer 1

Do not turn off the lights.

In order to turn negative, we add the negative words like "not" or "no" but we retain the meaning of the sentence.

Therefore we added the word not in the sentence but to retain the meaning of sentence, we had to add "turn off the lights" so that the overall meaning of the sentence remains the same, i.e., turn on the lights.