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I'd like to ask which of the following sentences is correct?

  1. These methods not only are efficient, but also raise the performance of our system.
  2. These methods are not only efficient, but also raise the performance of our system.

Thank you!

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    In usage, these are interchangable and equally correct with a shift in tone but not in meaning. – Nick May 17 at 7:41
  • @Nick I got it. Thanks! – ssz May 17 at 8:35
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If both descriptions were adjectives, I would expect to see These methods are not only efficient but also economical.

In your example, where the but also is a clause, I consider (1) to be better.

  • Your explanation helps me a lot. Thanks! – ssz May 17 at 8:36

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