1. The reporting verb is usually changed into another verb such as:
order, tell, command, etc.(for commands)
ask, request, plead, beg, etc.(for requests)
suggest, urge, forbid, warn, advice, etc.(for suggestions)
2.The verb in the reported speech is changed into affirmative.
3.A conjuction is not used to introduce the reported speech
I said to the cook,"Go to the market and buy fresh vegetables."(direct speech)
I told the cook to go to the market and buy fresh vegetables.(indirect speech)