What must be corrected in لَيْتَ الطَّالِبُ حَاضِرٌ?

Introduction to Mansubat and the Ism of Inna

• Change لَيْتَ to a preposition.
• Make both nouns majrur.
• Make the khabar mansub.
• Make the ism mansub: لَيْتَ الطَّالِبَ حَاضِرٌ.