How to make indirect speech

When reporting speech the tense usually changes. This is because when we use reported speech, we are usually talking about a time in the past (because obviously the person who spoke originally spoke in the past). The verbs therefore usually have to be in the past too.

Example:

“I’m going to the library”, he said. (direct speech)

He said he was going to the library. (indirect speech)


sumber: http://www.learnenglish.de/grammar/reportedspeech.htm