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Sentence analysis
6Spans
Sentence
Span Details
親友
close friend; best friendnoun
に
direction, time, indirect object, or target markergrammar
胸の内
what's in one's heart; one's emotional state; what one feelsexpression, noun
を
object markergrammar
明かし
pass the night; spend the night; reveal; disclose; divulge; prove; verify-> 明かすgodan verb
た。
past tense or completed actiongrammar