箱の中味を確かめずに開けた

N5 箱 hako box N3 中味 nakami contents, interior, filling N4 確か tashika certain, sure, if I remember correctly

N3 箱 sou / hako box, chest, case N5 中 chuu / naka, uchi, ata.ru in, inside, middle N4 味 mi / aji, aji.wau flavor, taste, goût N3 確 kaku, kou / tashi.ka, tashi.kameru assurance, firm, tight N4 開 kai / hira.ku, hira.ki, -bira.ki, hira.keru, a.ku, a.keru open, unfold, unseal

N3 〜ことなく koto naku Indicates absence of an action, attaches to a verb, written form meaning without doing N5 〜を o Marks the direct object of an action, appears before the verb, shows what receives the action N5 〜に ni Indicates destination, target, arrival point, specific time, or person receiving an action N5 〜の no Indicates possession, relation between nouns, nominal explanation, or turns a verb into a noun phrase N5 〜か ka Marks a question, alternative, or uncertainty, appears at the sentence end or between options