I know we generally use the singular verb in this structure, even if the answer is plural (in AmE, I think). As in:
Who is talking? - Jack is talking
Who is talking? - Joey and Sam are talking.
What if I use each other at the end?
Who is/are talking to each other?
The plural form sounds natural, but I'd like to know what native speakers of English think, and how they use it.
There are other links discussing the same topic, but I am emphasizing on the phrase to each other.
And I know you can simply say "Who is talking?", but my question is what happens when you use 'to each other'?
Or is it that it is grammatically wrong yo use to each other at the end of this questiom?