ما هو أفضل كتب إعراب القرآن؟

It is not possible to precisely determine the best, as there are many books on the grammatical analysis (i'rab) of the Qur'an. Among the best are: "I'rab al-Qur'an" by Ibn al-Nahhas al-Muradi, "Mushkil I'rab al-Qur'an" by Makki bin Abi Talib al-Qaysi, which clarifies difficult grammatical issues and their reasons, and "Al-Tibyan fi I'rab al-Qur'an" by Al-Ukbari, which focuses on grammatical analysis and the Qur'anic readings. Among the famous contemporary books is: "I'rab al-Qur'an wa Bayanuhu" by Muhyi al-Din Darwish, which has an easy style.