pamiršti

In a sentence

• Aš pamiršau tavo gimtadienį.

  I forgot your birthday.

  Here, 'pamiršti' is used to convey the act of forgetting something from past memory.

• Nepamiršk atsinešti knygos į klasę.

  Don't forget to bring the book to class.

  'Pamiršti' is used in an imperative negative form to instruct someone not to forget.

• Jis dažnai pamiršta padėkoti.

  He often forgets to thank.

  'Pamiršti' here indicates a habitual action of forgetting to perform an intentional act.