Косвенная речь: основы
He said that he was tired
Время сдвигается назад: am/is→was, do/does→did, will→would, can→could, have done→had done.
"I am busy" → He said he was busy. "I will come" → She said she would come.
Приказы/просьбы — через to V: He told me to wait. She asked us not to shout.