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Sentence analysis
6Spans
Sentence
Span Details
うっかり
carelessly; inadvertently; absent-mindedlyadverb
して、
light/support verb with a noun or noun-like phrase-> するgrammar
約束
promise; agreement; one's word; contract; appointment; engagement; date; convention; rule; destiny; fatenoun, suru verb
を
object markergrammar
忘れ
forget; leave behind-> 忘れるichidan verb
た。
past tense or completed actiongrammar