"I forgot" uses the simple past tense; "I've forgotten" uses the present perfect. Neither of these is the present participle. The simple past tells about factual situation in the past; the present perfect tells about a completed event in the past.
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Anonymous Hi everyone, Can someoneI forgot to attach the photos with the emailcanplease tell me whenI haveto use the past simple instead of the present perfect?participle present?I can't findout this simplethe answer. Should I say, I forgot or I've forgotten? Thanks!