Bhawna told Sohail that she had finished the project the previous day. Sohail responded that it was great and asked if she was going to present it the next day.
In reported speech, the verb tense changes from simple past to past perfect in Bhawna's statement, and the time expression “yesterday” changes to “the previous day.”
Sohail’s question is also reported by changing “tomorrow” to “the next day” and adjusting the verb form accordingly.