Identify the correct passive form: 'I heard her sing.'

Active: I heard her sing. Passive: She was heard to sing by me.

নিয়ম: Active-এর object passive-এর subject হয়; auxiliary verb বসে; মূল verb-এর past participle হয়; by বসে। Perception verb (see, hear, make, let, feel, watch ইত্যাদি) Active-এ bare infinitive নেয়, কিন্তু passive-এ to সহ full infinitive হয়।
Structure: Active: Subject + verb + object + bare infinitive. Passive: Object + be + past participle + full infinitive + by + subject.

• She was heard sing by me: 'to' বাদ পড়েছে, তাই ভুল।
• She was heard to be sung by me: passive infinitive ব্যবহার করায় অর্থ বদলে যায়।
• She was heard sung by me: sung উপযুক্ত নয়; ব্যাকরণগতভাবে ভুল।