Using if or whether (indirect)
If there is no question word (who, what, when, why, how) in a direct question, we need to use if or whether in the indirect question. For example:
Direct: Did she make it on time?
Indirect: Can you tell me if she made it on time?
or
Can you tell me whether she made it on time?
Direct: Is this the right bus for Oxford Street?
Indirect: Do you have any idea if this is the right bus for Oxford Street?