STATEMENTS.
Laura: "The sun sets at 5:46pm"
No change - Fact
Laura says the sun sets at 5:46pm.
Zack: The bus leaves at 8.
No change - Fact
He says the train leaves at 8.
Lisa: Did you complete the report?
We can change it or leave it in simple past.
Lisa asked me if I completed the report.
Lisa asked me if I had completed the report.
Chris: I will be there in 5 minutes.
No change - Immediate report.
Chris says that he will be here in 5 minutes.
He said to her father: "Please, please, let me go to the party"
He asked/begged his father to let him go to the party.
Ron: You must stay there.
Had to or must can be used.
Ron said we had to/must stay here.