子供たちが小屋の中で秘密基地を作ってる

N5 子供 kodomo child, children N3 小屋 koya hut, cabin, shed N5 中 naka inside / middle N3 秘密 himitsu secret, secrecy N2 基地 kichi base N3 作 saku work, production, harvest

N4 作 saku, sa / tsuku.ru, tsuku.ri, -zuku.ri make, production, prepare

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 〜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