Перевидите на англ, в обычную речь, в косвенную:

он сказал: я только что получил письмо от своего дяди

он сказал: я собираюсь в театр

он сказал: я уверен она позвонит мне

He said: " I have just got a letter from my dad."

He said that he had just got a letter from his dad.

He said:" I am going to the theatre."

He said that he was going to the theatre.

He said: "I am sure she will call me."

He said that he was sure she would call him.