`I know that he did the work`– বাক্যটির সঠিক পরিবর্তিত voice হবে–
It was known to me that the work hed been done by him
It was known to me that the work has been done by him
It is known to me that the work was done by him
Correct
It was known to me that the work was done by him
Explanation:
Correct Answer is: It is known to me that the work was done by him
`That` conjunction-এর উভয় পাশের sentence-কে যার যার Tense অনুযায়ী voice-এর পরিবর্তন করতে হয়। এজন্য প্রথম বাক্যটি Present Indifinite এবং দ্বিতীয় বাক্যটি Past Indefinite এ থাকায় Voice ঐ tense- অনুযায়ী হয়।