He had eaten rice before I went there. (Make it passive)

He had eaten rice before I went there- এই sentence টি Past Perfect tense এ আছে। 
• Past Perfect Tense এর Active voice- কে Passive voice এ রূপান্তর করার নিয়ম: 
- Object টি subject হবে + had been বসবে + Verb এর past participle form হবে + by + Subject টি Object হবে + clause বসবে। 
- সঠিক উত্তরটি হবে: Rice had been eaten by him before I went there. 

Source: A Passage to the English Language by S M Zakir Hussain.