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I.

  1. The attendant showed us to our seats.
  2. The attendant showed us our seats.
  3. The attendant showed our seats to us.
    II.
  4. Please show it to me.
  5. Please show me it.
    Please correct all.

I1. He took us or directed us to our seats.
2. He showed us the sears we would be sitting in. (So not as accurate as sentence 1 in this setting).
3. As 2, but the passive voice would not usually be used naturally in this context.

II. Both correct, with the same meaning but a different emphasis.