Sentence examples for doing what from inspiring English sources

"doing what" is a correct and usable phrase in written English
It is typically used to ask about someone's actions or behavior in a specific situation. Here is an example: "I saw John at the party last night, but I couldn't figure out what he was doing. Can you tell me, 'doing what'?" In this sentence, "doing what" is used to ask about John's actions at the party.