Present Simple Tense into Past Simple Tense
Direct speech: She always wears a coat.
Reported speech: He said (that) she always wore a coat.

Present Continuous Tense into Past Continuous Tense
Direct speech: I‘m looking for my keys.
Reported speech: She said that she was looking for her keys.

Present Perfect Tense into Past Perfect Tense
Direct speech: She has written three letters for her friend.
Reported speech: He said she had written three letters for her friend.

Past Simple Tense into Past Perfect Tense
Direct speech: My friend gave me a bar of chocolate.
Reported speech: He said that his friend had given him a bar of chocolate.