45. 'His performance surprised me'. The passive form of the sentence is-
I was surprised at his performance.
I had been surprised at his performance.
I was surprised by his performance.
ব্যাখ্যা: Past indefinite tense যুক্ত বাক্যের passive voice-এর structure হলো: Ob কে sub + was/were + verb-এর p.p+ by (surprise-এর ক্ষেত্রে at) + sub কে ob। সুতরাং প্রদত্ত বাক্যের passive form I was surprised at his performance .