1. He said: “I’m learning how to use a computer”
=>he said that he was learning how to use a computer

=>gthich: tobe=>was/were
2. Nam said: “We’ll have a meeting tomorrow”
=>Nam said that they would have a meeting the next day

=>gthich : will => would

               tomorrow => the next day
3. Mr. John said: “I phoned your parents two days ago, Miss white”
=>Mr.John told MissWhite that he had phoned her parents 2 days ago

=> gthich: phoned =>had phoned

 2 days ago giữ nguyên
4. “Our life has changed a lot since the invention of computer” said they
=>they said that their life had changed a lot since the invention of computer

=>gthich: has changed = >had changed 

                (trực tiếp)            (gián tiếp)