Here's why:
* Pronouns stand in for nouns. They refer to a noun that has already been mentioned or is understood. Examples: he, she, it, they, we, you, I, this, that, these, those.
* Determiners modify nouns. They come before the noun and provide information about the noun, such as quantity, possession, or specificity. Examples: a, an, the, some, any, every, each, my, your, his, her, their.
Examples:
* Pronoun: "The dog chased it." (It refers to the dog, which was mentioned earlier)
* Determiner: "Any dog can learn tricks." (Any modifies the noun "dog")
In summary: While "any", "an", and "every" are not pronouns, they are important words that help us understand how nouns are used in sentences.