What is the grammatical directive for the accusative case (naṣb) of "Jannāt" in Sūrat al-Anʿām, "Āyah" in Sūrat al-Aʿrāf, and "al-Ḥaqq" in Sūrat al-Anfāl?

Regarding the Almighty’s saying: "and gardens of grapevines" (Qur’an 13:4), it is conjoined with "the growth of every kind" (Qur’an 13:4). The word "Ayah" (sign) in the second verse (Qur’an 13:3) is in the accusative case (mansub) as a circumstantial adverb (hal), and what renders it so is the demonstrative pronoun, as it implies the meaning of a verb. The word "al-Haqq" (the truth) in the third verse (Qur’an 13:5) is the predicate (khabar) of "kana" (is/was), and the pronoun preceding it is a pronoun of separation (damir fasl).