Похоже, у вас задание на исправление времени глаголов, чтобы они согласовывались в тексте. Давайте рассмотрим предложения и исправим их:
He said, "I am at school now."
Прямая речь: "am" → Косвенная речь: "was" → He said that he was at school then.She said, "We are happy to see you."
Прямая речь: "are" → Косвенная речь: "were" → She said that they were happy to see me.He said, "I will come at 5 o'clock."
Прямая речь: "will come" → Косвенная речь: "would come" → He said that he would come at 5 o'clock.Father said, "My children have written a letter."
Прямая речь: "have written" → Косвенная речь: "had written" → Father said that his children had written a letter.My friend said, "I am doing my homework."
Прямая речь: "am doing" → Косвенная речь: "was doing" → My friend said that he was doing his homework.He said, "The ice is hard."
Прямая речь: "is" → Косвенная речь: "was" → He said that the ice was hard.
Преобразование прямой речи в косвенную включает изменение времени глаголов, если это необходимо, и замену местоимений для согласования с контекстом.