• He killed him (by) using a meat cleaver.
  • the gene editing methods (by) using a tool derived from a bacterial immune system called CRISPR.
  • he hit his wife (by) using his ring

These sentences are taken from a different books

The preposition I inserted into sentences are not really existed. My question is why do people not use the preposition ‘by’ in these situations?

  • 1
    Possible duplicate: What is difference between “using” and “by using”?
    – MetaEd
    Dec 11, 2017 at 22:18
  • @MetaEd you are right , but this point are not clarified enough to understand. Dec 11, 2017 at 22:23
  • A duplicate question will be closed. A good way to get a better answer on the existing question is to offer a bounty on it. This will get new attention to the question. There is even a place to explain why you offered a bounty.
    – MetaEd
    Dec 12, 2017 at 14:25


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