اعراب جملة بات الكتاب رفيقي

The sentence “بات الكتاب رفيقي” is analyzed as follows: بات is a past tense verb, with the subject الكتاب being in the nominative case. رفيقي is the predicate, in the accusative case, with the accusative marker hidden due to the preceding ياء. The ياء is a pronoun in the genitive case, serving as a possessive adjective.