Nahian said, "I am reading a book."

♦ Narration এর ক্ষেত্রে,

• Assertive sentence কে Indirect speech এ রূপান্তর এর সময়: 
- Reporting verb say/said or tell/told (object যদি থাকে) বসে
- Inverted comma উঠে গিয়ে conjunction ‘that’ বসে
- Reported speech এর subject বসে
- verb বসে
- বাকী অংশ বসে

Structure: Subject + say/said/tell/told + object + that + Reported Speech এর subject + verb + বাকী অংশ 

Direct: Nahian said, "I am reading a book."
Indirect: Nahian said that he was reading a book.

Source:  Advanced Learner’s by Chowdhury & Hossain