AnalyzerSentence analysis6SpansSentence招待状に返事をしなければならない。1000 character limitAnalyzeSentence招しょう待たい状じょうに返へん事じをしなければならない。Span Details招しょう待たい状じょうwritten invitation; invitation cardnounにdirection, time, indirect object, or target markergrammar返へん事じreply; answer; responsenoun, suru verbをobject markergrammarしlight/support verb with a noun or noun-like phrase-> するgrammarなければならない。must; have togrammarAlso Foundならないならないcannot help feeling; unbearably; irresistibly; must not; should not; must; have to; ought to; cannot; unable to; notoptional