This question already has an answer here:
I saw this sentence in the book 1Q84:
It's not just you that don't know.
However, I am having trouble figuring out why (or whether) this is the correct way to write the sentence, as opposed to:
It's not just you that doesn't know.
Now, according to owl.purdue.edu, we should use "doesn't" when the subject is singular (except when the subject is "you" or "I"), and "don't" otherwise. But in the example above, I am having a hard time figuring out what exactly the subject is and whether it is singular.
The reason my question is different from John's is that in John's, the subject is clearly "you." However, as I tried to articulate above, I am having a hard time figuring out what exactly the subject is in the quotes I gave and whether it is singular.