彼は今が人生の境目だと思った

N5 彼 kare he N5 今 ima now N3 人生 jinsei life, human life N3 境 sakai border, boundary, division N5 目 me eye N1 だと dato if it's the case

N3 彼 hi / kare, kano, ka.no he, that, the N5 今 kon, kin / ima now, maintenant, ahora N5 人 jin, nin / hito, -ri, -to person, être humain, personne N5 生 sei, shou / i.kiru, i.kasu, i.keru, u.mareru, uma.reru, u.mare, umare, u.mu, o.u, ha.eru, ha.yasu, ki, nama, nama-, na.ru, na.su, mu.su, -u life, genuine, birth N2 境 kyou, kei / sakai boundary, border, region N4 目 moku, boku / me, -me, ma- eye, class, look N4 思 shi / omo.u, omoera.ku, obo.su think, penser, pensar

N5 〜と思う to omou Indicates speaker thought opinion or assumption, connects clause with mental expression N5 〜が ga Marks the grammatical subject, highlights new information, can also show slight contrast in some sentences N5 〜と to Indicates company, quotation, natural condition, complete list, or direct connection between elements N5 〜の no Indicates possession, relation between nouns, nominal explanation, or turns a verb into a noun phrase N5 〜は wa Marks the topic of the sentence, indicates what the sentence is about, can contrast with another element, organizes main information