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I am an English tutor. I also lived in the USA for 2 years. Today when I was explaining to my student the use of 'any' in questions and negations, I got stuck. I know we use it before countable nouns in plural and we use it before an uncountable noun. But from my experience speaking English on a daily basis back in the USA I remember people using 'any' with a singular countable noun. For example, 'Is there any room available?'. What are your thoughts on that? Maybe it's the matter of British and American English?