When the direct question begins with an auxiliary(be,do,did.etc.) or a modal verb(can,may,etc.) then the reported question is introduced with if or whether
Do you want to dance?
Has John arrived?
Did you watch the latest film?
Will you come later?
Where are my glasses?
What’s John doing?
What did he deny?
Where did you buy your laptop?
What do you think of the new film?
Have they seen all the rooms yet?
How long have you been reading the book?
Who is Ann going to take care of?
How long have you been waiting for me?
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