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Why is it important to distinguish Noon-e-I'raabi from the final Noon in يَفْعُلْنَ and تَفْعُلْنَ?

Conjugating the Present Active (Mudhaari' Ma'roof) & Noon-e-I'raabi

• Because the seven inflectional Noons can drop under later governing particles, while the feminine-plural Noons remain
• Because the feminine-plural forms are past tense
• Because Noon-e-I'raabi occurs in all 14 forms
• Because the two types of Noon are written with different letters