I have seen "is “any” also used with plurals", which explains that any can be used with singular, plural, and uncountable nouns.
However, I want to ask specifically about questions. E.g.:
Is there any girl in the room?
To me it seems that this is asking, "is there at least one girl?". But my English grammar book says that any should only be used with uncountable or plural nouns. So I suppose I should be asking either of the following instead:
- Is there a girl in the room?
- Are there any girls in the room?
Is that true? Is the textbook correct in saying that any should not be used with countable nouns in singular? Then what about "Do you have any idea"? Idea is countable, just like girl is.