Can we use possessive pronouns in tag questions? For example,
Your name is Ben, isn't yours?
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No, that would be incorrect. as Cerberus stated, the correct sentence would be "Your name is Ben, isn't it?" The correct pronoun to use in the tag question is the "it" not the possessive "yours."
It does sound weird. The tag question construction when formed from a clause with a [be] auxiliary or copula needs a subject pronoun to stand in. Not surprisingly, all the top hits in COCA are for the subject pronouns it, you, they, he, we, she, they. We also see expletive there showing up frequently when the tag is formed off of an existential there construction. There are, however, two hits that merit some scrutiny,
Both of these come from talkshow transcripts, where people are speaking fast and constantly interrupting each other.
When we weed out the spurious uses of
And the instance of
I wouldn't be surprised to find in very casual or incautious speech something like
For a non-native speaker, though, steer clear!
I can imagine a sentence like: "My dog is a dachshund, isn't yours?" but this would probably not technically qualify as a tag question. We would absolutely never say, "My dog is beautiful, isn't mine?"