彼の集中力が欠けてきた

N5 彼 kare he N3 集中 shuuchuu concentration, focus, centralization N4 力 chikara strength, power, force

N3 彼 hi / kare, kano, ka.no he, that, the N4 集 shuu / atsu.maru, atsu.meru, tsudo.u gather, meet, congregate N5 中 chuu / naka, uchi, ata.ru in, inside, middle N4 力 ryoku, riki, rii / chikara power, strength, strong N3 欠 ketsu, ken / ka.keru, ka.ku lack, gap, fail

N5 〜が ga Marks the grammatical subject, highlights new information, can also show slight contrast in some sentences N5 〜の no Indicates possession, relation between nouns, nominal explanation, or turns a verb into a noun phrase