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Sentence

彼かれは約やく束そくをけろりと忘わすれていた。

Span Details

約やく束そく

promise; agreement; one's word; contract

noun, suru verb

completely; entirely

adverbial manner marker (with adverbs and mimetics)

forget; leave behind

-> 忘れるichidan verb

ongoing or resultant state

-> ているgrammar

past tense or completed action