1

They will never forget what you did.

They will never forget what you have done.

Which one is correct?

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  • 3
    These are both grammatically correct, and they mean the same thing. The connotation might be different in some contexts.
    – Era
    Apr 22 '16 at 15:22
  • When you use the present perfect, it's because you're thinking about the present anyhow.
    – Schwale
    Apr 22 '16 at 15:33
  • They are both correct. What makes you think one or the other night not be correct? Apr 22 '16 at 17:03
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They will never forget what you did.

The use of simple past implies that the action was completed some time ago and had no consequences. This is odd as, apparently, "they will never forget", so the consequences are lasting.

I don't want to rule it out completely though, because somebody might say this to make it clear that they are talking about one specific event.

They will never forget what you have done.

Present perfect simple implies that some action was started in the past and it continues to the present, or that the action was completed but the consequences continue. This makes far more sense.

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Both of your phrases

They will never forget what you did
They will never forget what you have done

have the same meaning that an action will be remembered, and are usually interchangeable.

They will never forget your kindness and what you did for them.
They will never forget your kindness and what you have done for them.

what you have done

tends to be more formal

The people of this country will always be grateful for what you have done for them. ( formal ) The team will never forget what you did to win the final game. ( less formal )

As @JavaLatte implicitly points out, when followed by "to + obj", usually something negative is mentioned and when followed by "for + obj", something positive is mentioned (the example above is "to + inf").

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