لَيْتَ لِي وَقْتًا أَقْرَأْ فِيهِ.
Translation: If only I had time, I could read during it.
Layta expresses a wish. Aqraʾ is jussive in a causally intended response to that wish.
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Jussive after a Wish
The Jussive Imperfect: Governors, Conditions, and Request Responses
لَيْتَ لِي وَقْتًا أَقْرَأْ فِيهِ.
Translation: If only I had time, I could read during it.
Layta expresses a wish. Aqraʾ is jussive in a causally intended response to that wish.