أَيَّ كِتَابٍ تَقْرَأْ تَسْتَفِدْ مِنْهُ.
Translation: Whichever book you read, you will benefit from it.
Ayy is a declinable conditional noun. Ayy(a) is an accusative object in this sentence and kitab(in) its genitive complement; the two verbs are jussive.
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Ayy as a Conditional Noun
The Jussive Imperfect: Governors, Conditions, and Request Responses
أَيَّ كِتَابٍ تَقْرَأْ تَسْتَفِدْ مِنْهُ.
Translation: Whichever book you read, you will benefit from it.
Ayy is a declinable conditional noun. Ayy(a) is an accusative object in this sentence and kitab(in) its genitive complement; the two verbs are jussive.