Did you request him to sing this song ?
Or
Did you ask him to sing this song?
anonymous Did you ask him to sing this song? this one is correct because it sounds more natural
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anonymousDid you ask him to sing this song?
this one is correct because it sounds more natural
anonymousDid you request him to sing this song ?
Or
Did you ask him to sing this song?
In ordinary conversation we would use the second one.
The first one is much more formal.
CJ