«قَرَأْتُ الْكُتُبَ الَّتِي اشْتَرَيْتُهَا» — I read the books that I bought.
«الْكُتُبَ» is the accusative object; «الَّتِي» modifies it in an accusative syntactic position; the «ها» in its ṣilah is the ʿāʾid.
Arabic commonly uses feminine singular agreement for non-human plurals. This is an added teaching explanation beyond the core list.
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Relative Nouns — Ṣilah, ʿĀʾid, Forms and Syntax
«قَرَأْتُ الْكُتُبَ الَّتِي اشْتَرَيْتُهَا» — I read the books that I bought.
«الْكُتُبَ» is the accusative object; «الَّتِي» modifies it in an accusative syntactic position; the «ها» in its ṣilah is the ʿāʾid.
Arabic commonly uses feminine singular agreement for non-human plurals. This is an added teaching explanation beyond the core list.