Keep the two doors separate by their forms and meanings.
MeaningMasdarExampleBab
become heavy/sluggishاِثَّاقُلٌاِثَّاقَلَ8
become purifiedاِطَّهُرٌاِطَّهَّرَ9
Their Ism Fa'il forms are مُثَّاقِلٌ and مُطَّهِّرٌ.
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Bab 8 and Bab 9: Compare Them
Derived Trilateral - Bab 8: If'aal & Bab 9: If'il (Assimilation Doors)
Keep the two doors separate by their forms and meanings.
MeaningMasdarExampleBab
become heavy/sluggishاِثَّاقُلٌاِثَّاقَلَ8
become purifiedاِطَّهُرٌاِطَّهَّرَ9
Their Ism Fa'il forms are مُثَّاقِلٌ and مُطَّهِّرٌ.