AnalyzerSentence analysis4SpansSentence二人は固い約を交わした。1000 character limitAnalyzeSentence二人ふたりは固かたい約やくを交かわした。Span Details二人ふたりtwo people; pair; couplenounはtopic markergrammar固かたいhard; solid; tough; stiff; tight; wooden; unpolished; strong; firm; not easily moved; steadfast; honest; safe; obstinate; bookish; formal; stuffy-> 硬いi-adjective約やくを交かわした。exchange promises; make a mutual pledge-> 約を交わすexpression, verb