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Difference between Forget doing something and Forget to do something

forget doing somethingfail to keep in mind smth. that one has done:

  • I guess she forgot talking to me yesterday and did not recognize me earlier. She is so busy after all.

forget to do somethingfail to bear in mind smth. that one has to do:

  • I’m not used to asking permission to do what I need to do, so it seems I forgot to talk to the manager.