Both forgot and forgotten are used as the past participle of forget: Many have already forgot (or forgotten) the hard times of the depression. Only forgotten is used attributively:

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She never forgets her daddy's birthday. To cease or fail to remember; Be unable to recall. See examples of forget used in a sentence. The meaning of forget is to lose the remembrance of : Be unable to think of or recall. How to use forget in a sentence.

The meaning of forget is to lose the remembrance of : Be unable to think of or recall. How to use forget in a sentence. Synonym discussion of forget. To be unable to remember a fact, something that happened, or how to do something: English dictionary and integrated thesaurus for learners, writers, teachers, and students with advanced, intermediate, and beginner levels.

English dictionary and integrated thesaurus for learners, writers, teachers, and students with advanced, intermediate, and beginner levels.