Question

Turn the sentences into indirect speech.
He said, "I will have been writing a dictation for two hours by the time you come to my class".
He says, "I have received your letter".
He said, "My mother works here".

Answer 1

He said he  would have been writing a dictation for two hours by the time you came to his class.  

He says  he has received your letter.

He said that his  mother worked  there.