12.He said"I will go to school by bus tomorrow"
->He said(that)he would go to school by bus the next day.
13.Phong said"I need to learn more vocabulary"
->Phong said(that)he needed to learn more vocabulary
14.His brother told him"You can use my computer today"
->His brother told him he could use his computer that day.
15. Mai said “I can not go to the movies with you, Nam”
->Mai said to Nam she could not go to the movies with him.