"What did you did?"

[Stefanie]

I'm just reading a book by John Irving, "A widow for one year" - and I came across the above phrase at least twice.
Here's one example for how he used it

[Mister Micawber]

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Yes, it is the representation of a typical 4-year-old learning her grammar.
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_________________
Native English teacher at Mister Micawber's

[Stefanie]

OK, thank you!