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What he did?

and:

What did he do?

What is happen if we add one "DO" in the sentence, does it change the meaning of the sentence?

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    "What he did?" is not idiomatic English. Correct usage would be "What did he do? What did he say? What did he bring?" and the like. – Kate Bunting Jul 10 '16 at 15:16
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    'What he did?' is acceptable as an echo question; it is unacceptable as an alternative for 'What did he do?' – Edwin Ashworth Jul 10 '16 at 16:31
  • You haven't just added a DO, you've also changed the order of the words. – J.R. Jul 11 '16 at 0:54
  • "to die" sounds scheduled. "We are to die on Wednesday unless the mayor grants us a reprieve." – Leo Jul 11 '16 at 3:10
  • Possible duplicate of did + present tense (or ) Past tense of the verb – Alan Carmack Jul 11 '16 at 5:16
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"What he do?" is not correct English. So, there technically isn't a difference, as one of the options doesn't exist. "What did he do?" is a question that asks what a person (he) did (and presumably finished) in the past.

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