She insisted on … leaving the house.

✅ কেন সঠিক: Gerund (‘leaving’)-এর আগে কর্তা বোঝাতে possessive form বসে: She insisted on his leaving the house.

❌ অন্য অপশন: he (subjective), him (objective) ও himself (reflexive) gerund-এর আগে মানক ইংরেজিতে বসে না।

💡 মনে রাখুন: Possessive + gerund: I don’t mind his coming late.