You need to provide said excerpt so I can answer...
Answer:
1)”I’m a student” Tom said.
Tom said that he was a student.
2)”I’m living in London now” Charles said.
Charles said he was living in London then.
3)”You are my best friends” Jane said to us.
Jane told us we were her best friends.
4)”I don’t know what Fred is doing” Jonny said to me.
Jonny told me that he didn't know what Fred was doing.
