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What spelling change occurs in لَنْ تَفْعُلِيْ compared to its positive state تَفْعُلِيْنَ?

Conjugating Future Negation with "Lan" (Active & Passive)

• The Kasrah of the Ayn-letter changes to Fathah
• The final letter Noon-e-I'raabi is dropped
• A silent Alif is added after the Yaa
• No spelling change occurs