Как перевести do в косвенную речь?

We make some changes when we change direct speech into indirect. We change Present Indefinite into Past Indefinite. (do - did).

He said '' I do my homework.'' (Present Indefinite).

He said that he did his homework. (Past Indefinite).

If the first part is in Present Indefinite we don't change tense in the second part.

She says '' They do their duties.''

She says they do their duties.

If do is used as an auxiliary verb we don't use it in indirect speech.

He asked ''Do I play tennis?''

He asked if he played tennis.