Mutamenti di tempi e modi

Quando avviene la trasformazione di un comando, l’imperativo diventa un infinito (to + ) introdotto da un verbo come: tell, ask, say, order ecc.:

Ted, open the window.	He’s asking Ted to open the window.
Don ‘t go to the blackboard.	I told him not to go to the blackboard.

Quando il verbo con cui si riferisce un discorso indiretto è al presente, al futuro o al passato prossimo, non vi è cambiamento di tempo nelle parole che vengono riferite:

It’s going to be fine tomorrow.

He says / ‘ll say / ‘s just said it’s going to be fine tomorrow.

Invece quando il verbo che introduce la frase è al passato, al trapassato o al condizionale, si opera solitamente un cambiamento di tempi e di avverbi:

He’ll be very tired tomorrow.	He thought he would be very tired the next day.
She has finished her work.	She said she had finished her work.
They can speak Italian fluently.	They said they could speak Italian fluently.
She has written two letters.	She had told us she had written two letters.