In Oxford dictionary the definition of a pronoun is as below:
Pronouns are used in place of a noun that has already been mentioned or that is already known, often to avoid repeating the noun.
Thus, based on the frequent pronouns, i.e., she, her, ..., I conclude that any as a pronoun cannot be both plural and singular at the same time. With this regard, which one is correct in below imaginary conversation?
A: I need some screws.
B: Is there any in your pocket? or Are there any in your pocket?
If I am wrong, I will be happy to know your correction(s).