Er sagt, dass er morgen komme.
English: He says that he will come tomorrow.
Indirect speech in German is used to report what someone else said, without quoting them directly. It often uses 'dass' (that) and the special verb forms called Konjunktiv I or II.
Use indirect speech in German when you want to report what someone else said, especially in newspapers, formal writing, or when you are not quoting the exact words.
Er sagt, dass er morgen komme.
English: He says that he will come tomorrow.
Sie behauptet, dass sie das Buch gelesen habe.
English: She claims that she has read the book.
Peter meint, dass er keine Zeit habe.
English: Peter thinks that he has no time.
Der Lehrer sagt, dass die Schüler fleißig seien.
English: The teacher says that the students are diligent.