彼、塀の向こうに誰かいるのに気づいた

N5 彼 kare he N3 塀 hei wall, fence N5 向こう mukou over there, beyond, opposite side N5 誰か dareka someone N4 気 ki spirit, mood, feeling, energy

N3 彼 hi / kare, kano, ka.no he, that, the N1 塀 hei, bei fence, wall, (kokuji) N3 向 kou / mu.ku, mu.i, -mu.ki, mu.keru, -mu.ke, mu.kau, mu.kai, mu.kou, mu.kou-, muko, muka.i yonder, facing, beyond N1 誰 sui / dare, tare, ta who, someone, somebody N5 気 ki, ke / ki spirit, mind, air

N4 〜のに noni Indicates unexpected contrast, connects two opposing ideas, means although, despite, even though 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 N5 〜か ka Marks a question, alternative, or uncertainty, appears at the sentence end or between options