事故の原因を調べる

N4 事故 jiko accident, incident N4 原因 genin cause, reason, origin N4 調べる shiraberu check, look up, research

N4 事 ji, zu / koto, tsuka.u, tsuka.eru matter, thing, fact N1 故 ko / yue, furu.i, moto happenstance, especially, intentionally N3 原 gen / hara meadow, original, primitive N3 因 in / yo.ru, china.mu cause, factor, be associated with N3 調 chou / shira.beru, shira.be, totono.u, totono.eru tune, tone, meter

N5 〜を o Marks the direct object of an action, appears before the verb, shows what receives the action N5 〜の no Indicates possession, relation between nouns, nominal explanation, or turns a verb into a noun phrase