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 .