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 "Which" can be used after a preposition, especially in more formal writing. Example: "There are several small ponds in which a variety of fish live." Less formal alternative: "There are several small ponds which a variety of fish live in ." Example: "This is the quotation to which I was referring." Less formal alternative: "This is the quotation which I was referring to ."

When "which" is used to ask a question, it implies a choice from a limited or specific set of options. As an Interrogative Determiner (modifying a noun): "Which" comes before a noun to ask about a specific item from a group. Example: "Which car are we taking?" (Implies a choice between, say, the red car or the blue car, not any car in the world.) Example: "Which museums did you visit?" (Asking about a specific list of museums.) Example: "Which color do you prefer?" (Implying a selection from a few available colors.) As an Interrogative Pronoun (standing alone): "Which" can stand in for the noun being asked about. Example: "Which do you prefer ? Tea or coffee?" (The options are explicitly stated.) Example: "Of all the books, which is your favorite?" (Implies a known set of books.) "Which" vs. "What" in Questions: The key difference between "which" an...