I have a question concerning the analysis of the following text sample:
"Rachel is not stupi. She has a doctorate in bio-chemistry from the University of Chicago and works as a researcher for alarge drug company outside Princeton, but much like her mother before her, it's a rare day when she speaks in anything but platitudes."
Now, the question is how to explain the form and use of the word "anything" (in the last sentence, last but two word). What is the correct term for the grammatical form of "anything in this sentence?
Hope you can help.