Sentence examples for why I do from inspiring English sources

The phrase 'why I do' is correct and usable in written English.
It is typically used in interrogative sentences to inquire about the reasoning or motivation behind someone's actions. It can also be used in declarative sentences to provide an explanation or justification for one's actions. Example: "I can't understand why I do these things sometimes." "I wonder why I do the things I do." "Let me explain why I do things this way."