I know for a fact that you can use plural nouns after "there's", which is an existential construction. I encountered a post on Stack Overflow today which went like this:
. . . this is questions.
Now, of course it was ungrammatical because what the poster actually meant was "these are questions", but that's not my concern.
Is there a context where "This is questions" would ever be grammatical? I'm thinking it should be a standalone sentence, "this" being its subject and "questions" or any other plural noun, its predicative complement.
I took a peek at the Wikipedia article on existential clauses but there was no mention of "this". Considering it's traditionally classified as a demonstrative pronoun, I would think it would've been listed there.