You are always talking in class.", I said to him. -> I said to him that he was always talking in class.............................

I’ve made a big mistake!’ said Peter. -> Peter said that.he had made a big mistake!..............................

John said: "I must stay at home tonight to finish my homework” ->John said that.he had to  stay at home that night to finish his homework.......................

John said: "My mother will visit Hanoi next year,”
->John said that....his mother would visit Hanoi the following year,.................

You can read without your glasses.”, John said to his father.
->John said to his father.he  could read without his glasses.................................