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Sentence analysis
8Spans
Sentence
Span Details
この
this; last (couple of years, etc.); these; past; you (as in "you liar")-> 此のpre-noun adjective
化学反応
chemical reaction; unexpected synergy; surprising outcome from combining thingsnoun
に
direction, time, indirect object, or target markergrammar
は
topic markergrammar
触媒
catalystnoun
が
subject markergrammar
必要
necessary; needed; essential; necessity; need; requirementna-adjective, noun
だ。
plain copulagrammar