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Sentence

うっかり者ものだから、約やく束そくを忘わすれた。

Span Details

うっかり者もの

careless person; absentminded person; thoughtless person

therefore; because of that

約やく束そく

promise; agreement; one's word; contract

noun, suru verb

forget; leave behind

-> 忘れるichidan verb

past tense or completed action