2 added 246 characters in body
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Person A (named Tom) has said something to Person B. However, Person B's identity is a mystery. Who is Person B? We ask Person C. These sentences should work:

  • Who was Tom speaking to?

  • Who was Tom speaking with?

  • Who was Tom talking to?

  • Who did Tom tell? (this means he told them a certain specific fact)

Another scenario. Person A (named Tom) has said something about/regarding Person B. However, Person B's identity is a mystery. Who is Person B? We ask Person C.

  • Who was Tom talking about?

  • Who was Tom referring to?

Third scenario. The topic of conversation is a rock concert, for example.

  • Who did Tom tell the story to?

  • Who was Tom discussing the show with?

  • Who was Tom talking to about the show?

  • With whom was Tom discussing the show?

Person A (named Tom) has said something to Person B. However, Person B's identity is a mystery. Who is Person B? We ask Person C. These sentences should work:

  • Who was Tom speaking to?

  • Who was Tom speaking with?

  • Who was Tom talking to?

  • Who did Tom tell? (this means he told them a certain specific fact)

Another scenario. Person A (named Tom) has said something about/regarding Person B. However, Person B's identity is a mystery. Who is Person B? We ask Person C.

  • Who was Tom talking about?

  • Who was Tom referring to?

Person A (named Tom) has said something to Person B. However, Person B's identity is a mystery. Who is Person B? We ask Person C. These sentences should work:

  • Who was Tom speaking to?

  • Who was Tom speaking with?

  • Who was Tom talking to?

  • Who did Tom tell? (this means he told them a certain specific fact)

Another scenario. Person A (named Tom) has said something about/regarding Person B. However, Person B's identity is a mystery. Who is Person B? We ask Person C.

  • Who was Tom talking about?

  • Who was Tom referring to?

Third scenario. The topic of conversation is a rock concert, for example.

  • Who did Tom tell the story to?

  • Who was Tom discussing the show with?

  • Who was Tom talking to about the show?

  • With whom was Tom discussing the show?

1
source | link

Person A (named Tom) has said something to Person B. However, Person B's identity is a mystery. Who is Person B? We ask Person C. These sentences should work:

  • Who was Tom speaking to?

  • Who was Tom speaking with?

  • Who was Tom talking to?

  • Who did Tom tell? (this means he told them a certain specific fact)

Another scenario. Person A (named Tom) has said something about/regarding Person B. However, Person B's identity is a mystery. Who is Person B? We ask Person C.

  • Who was Tom talking about?

  • Who was Tom referring to?