Breakdown of kare no soba ni suwarimashita.
のno
possessive case particle
にni
at; on; in; to; for [indirect object particle]
彼kare
he
座るsuwaru
to sit
側soba
near; beside
側 is usually written using kana alone as そば, and indicates proximity or nearness to something or someone, without specifying a particular side.
側 specifies a particular side or aspect of something. Often used with direction words to indicate specific sides, such as right, left, this side, that side, etc.
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