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Sentence analysis
10Spans
Sentence
Span Details
その
that; the; part; section; number; um; er; uh-> 其のpre-noun adjective, interjection
理論
theorynoun
に
direction, time, indirect object, or target markergrammar
は
topic markergrammar
確か
sure; certain; definite; reliable; trustworthy; accurate; if I remember correctly; if I'm not mistakenna-adjective, adverb
な
adnominal form of the copula after a na-adjectivegrammar
プルーフ
proof (alcohol content); -proof (resistant); proof (printing); proof; evidencenoun
が
subject markergrammar
必要
necessary; needed; essential; necessity; need; requirementna-adjective, noun
だ。
plain copulagrammar