1.He said"I have already read this book"
=>He said he had already read that book.
2.Join said to his sister "I want to buy a gift for our mother"
=>Join told his sister he wanted to buy a gift for their mother.
3.Mrs Brown said "Where are they living?"
=>Mrs Brown asked me where they were living.
4."Do you know the girl over there?" Tom said
=>Tom asked me if I knew the girl over there.
5.Mother said "Nam,why don't you go to bed?"
=>Mother asked Nam why he didn't go to bed.