鳥の群れが空を飛んでる

N5 鳥 tori bird N2 群れ mure crowd, flock, herd N5 空 sora sky

N4 鳥 chou / tori bird, chicken, oiseau N2 群 gun / mu.reru, mu.re, mura, mura.garu flock, group, crowd N4 空 kuu / sora, a.ku, a.ki, a.keru, kara, su.ku, su.kasu, muna.shii empty, sky, void N3 飛 hi / to.bu, to.basu, -to.basu fly, skip (pages), scatter

N4 〜ので node Indicates cause or reason in a softer way than kara, connects two clauses, often used in polite explanations N5 〜が ga Marks the grammatical subject, highlights new information, can also show slight contrast in some sentences N5 〜を o Marks the direct object of an action, appears before the verb, shows what receives the action N5 〜で de Indicates where an action happens, means used, tool, cause, or material depending on context N5 〜の no Indicates possession, relation between nouns, nominal explanation, or turns a verb into a noun phrase