彼、人口の減少が問題になってる

N5 彼 kare he N4 人口 jinkou population, number of people N3 減少 genshou decrease, reduction, decline N5 問題 mondai problem, question

N3 彼 hi / kare, kano, ka.no he, that, the N5 人 jin, nin / hito, -ri, -to person, être humain, personne N4 口 kou, ku / kuchi mouth, bouche, boca N2 減 gen / he.ru, he.rasu dwindle, decrease, reduce N4 少 shou / suku.nai, suko.shi few, little, un petit peu N4 問 mon / to.u, to.i, ton question, ask, problem N4 題 dai topic, subject, sujet

N5 〜ている te iru Indicates ongoing action, continuous state, repeated habit, or resulting condition depending on context N5 〜が ga Marks the grammatical subject, highlights new information, can also show slight contrast in some sentences 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