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Sentence analysis
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Sentence
Span Details
この
this; last (couple of years, etc.); these; past; you (as in "you liar")-> 此のpre-noun adjective
数学
mathematicsnoun
の
possession, attribution, nominalizer, or nominal linkergrammar
難題
difficult problem; challengenoun
は
topic markergrammar
誰にも
to anyone; to everyone; by anyone; by everyone; in anyone; in everyoneexpression
解けなかっ
unsolvable; insoluble-> 解けないi-adjective
た。
past tense or completed actiongrammar