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

How to use forget in a sentence. Synonym discussion of forget. English dictionary and integrated thesaurus for learners, writers, teachers, and students with advanced, intermediate, and beginner levels. To be unable to remember a fact, something that happened, or how to do something: If you forget something or forget to do it, you fail to think about it or fail to remember to do it, for example, because you are thinking about other things. She never forgets her daddy's birthday.

She never forgets her daddy's birthday.