সঠিক উত্তর হচ্ছে: He said that he knew that boy
ব্যাখ্যা: Direct speech এর tense---Present Indefinite tense হলে Inderect speech এর tense--Past Indefinite,Present continuous---Past continuous,Present perfect--Past perfect,Present perfect continuous---Past perfect continuous, Past Indefinite--Past Perfect,Past continuous---Past perfect continuous tense হবে।