Identify the correct passive form: ‘I heard her sing.’

✅ কেন সঠিক: Active voice-এ see, hear, make, let-এর পরে to-বিহীন infinitive বসলেও passive voice-এ to যুক্ত হয়: She was heard to sing by me।

❌ অন্য অপশন: ‘heard sing’ (to নেই), ‘to be sung’ ও ‘sung’ — গঠনগতভাবে ভুল।

💡 মনে রাখুন: I made him go → He was made to go।