Step-by-step explanation:
My father asked who had been using his phone.
He asked his guests if they wanted to see his new collection of pictures.
She asked her sister who she had given the books to.
Tom asked if there were any letters for him.
He asked Ann how long she had been taking her course in English.
The teacher asked why the student wasn't getting ready for the exam.
Ann asked if anyone wanted the tickets for the theatre.
He asked his brother which subjects he was taking at the university.
My hostess asked if I had slept well the previous night.
The students asked Mrs. Gavin if she had ever been to London.