Question

change the following into indirect speech. " why did you throw it away? "said the father to his son. i didn't like it ", said the son.

Answer 1

Father asked his son that why had he thrown that away.
The son told his father that he didn't like that.(bcz he still does not like it).

Answer 2

Father asked to his son that why he thrown that away and the son replied that he did not line that.

Or you can write it as Father asked to his son that why he thrown that away and the son replied that he thrown it away because he does not like it.

When you change a sentence into indirect speech, you need to change the statements without quoting them explicitly.