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Sentence analysis
7Spans
Sentence
Span Details
この
this; last (couple of years, etc.); these; past; you (as in "you liar")-> 此のpre-noun adjective
事件
incident; case; affair; eventnoun
の
possession, attribution, nominalizer, or nominal linkergrammar
鍵
key; lock; key (to a problem, success, etc.); cluenoun
は
topic markergrammar
ファクターX
unknown factor; X factor; mystery element-> ファクターＸnoun
だ。
plain copulagrammar