Change into reported speech.

 He said,

"When he left they were still working."

"She has been reading since I came home."

"You speak as if you had witnessed the event."

"You can have a rest if you are tired."

"He may not enter the room if you are not allowed to."

"The sun rises in the east."

"Great Britain is a monarchy."

He said that when he had left they had been still working.

    He said that she had been reading since he had come home.

He said that I spoke as if I had witnessed the event.

He said that I could have a rest if  I was tired.

He said that he might not enter the room if I was not allowed to.

He said that the sun rose in the east.

He said that Great Britain was a monarchy.