Don't waste your time. ?

The phrase "Don't waste your time" is a directive that advises against the misallocation of one's valuable time. To rephrase this command while maintaining its original intent, we must choose a construction that effectively conveys a similar message.

Option D, "Let not your time be wasted," is the most accurate rephrasing because it captures the essence of the original statement by employing an imperative structure using "let not," which strongly suggests a prohibition against allowing time to be wasted. This construction aligns closely with the admonitory tone of the original phrase.

On the other hand, options A and B modify the original meaning. Option A, "Let your time but not wasted," is grammatically incorrect and unclear. Option B, "Let your time not be wasted," while grammatically correct, comes across as a softer suggestion rather than a firm directive. Option C, "Let your time be wasted," directly contradicts the original message by accepting the waste of time.

In summary, Option D is the best choice because it preserves the imperative nature of the warning, making it clear that one should actively prevent their time from being wasted. This rephrasing not only maintains the urgency of the original statement but also articulate it in a formal and emphatic manner.