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What can he not do vs What can't he do

Both "What can he not do?" and "What can't he do?" are correct and commonly used in English. They are interchangeable and have the same meaning. The choice between the two depends on your personal preference or your desired style of speech/writing.
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Explained by Jennifer
Editor at TextRanch

Last updated: August 12, 2024

What can he not do

This phrase is correct and commonly used in English.

This phrase is a correct way to form a question about the abilities or possibilities of someone, emphasizing the negation by using "not".

Alternatives:

  • What is it that he cannot do?
  • What is beyond his abilities?
  • What is out of his reach?
  • What is impossible for him?
  • What are his limitations?

What can't he do

This phrase is correct and commonly used in English.

This phrase is a correct way to form a question about the abilities or possibilities of someone, using the contraction "can't" for "cannot".

Alternatives:

  • What can he not do?
  • What is it that he cannot do?
  • What is beyond his abilities?
  • What is out of his reach?
  • What is impossible for him?

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