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I'm wondering what prepositions to use after "assist someone." It seems there is a choice between "in" and "with," but I don't know if they are freely interchangeable. If they are interchangeable in particular sentences, is there any subtle difference?

  1. You will be employed to assist in/with the development of new equipment.
  1. Two men are assisting the police in/with their enquiries.
  1. We are looking for people who would be willing to assist in/with the group's work.
  1. Another doctor assisted him in/with the operation.
  1. A senior academic would assist him in/with his work.
  1. The cream assists in/with the prevention of skin cancer.

Could it be that "in" followwed by a noun (phrase) suggests that work of a more general nature is involved, whereas "with" suggests more specificity, tied to a paritcular task?

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