Hello, Seems to me that only the first one is correct. " ~Past Simple Still, I believe the first is better.
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stephenlearnerSorry, I have forgotten his number.Use this one. The present perfect shows current relevance, and that's what you have here -- current relevance.
stephenlearnerHi,Can you give Stephen a call for me?Sorry, I have forgotten his number.Sorry, I forget his number.Are both of the answers correct? yes If so, which is better? There is a prevalent, especially among British speakers, but erroneous perception that the first one is better.