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Sentence

彼かれは問もん題だいの根こん源げんを探さぐろうとした。

Span Details

問もん題だい

problem; issue; matter

noun

possession, attribution, nominalizer, or nominal linker

根こん源げん

root; source; origin; cause

探さぐろう

probe into; investigate; sound out

-> 探るgodan verbvolitional form of さぐる

-> ようとしたgrammar