Direct speech are exact quotes of the speech. They are completely identical transcripts of speech between two people.
He said, “Tell me what you know.”
I said, “I don’t know anything on this topic.”
Reported speech is the way a listener would narrate the incident in front of another person.
He asked me to tell what I knew
I said that I didn’t know anything on that topic.
The verbs in present tense will change into their corresponding past tenses in the following manner −
The only action words that will not change its tense are actions that are universal truth.