Using Whose

 "Whose" is a versatile word in English grammar, primarily used to indicate possession. It can function in two main ways:

1. As a Question Word (Interrogative Determiner/Pronoun):

 * To ask about possession: When you want to know who something belongs to, you use "whose."

   * Whose book is this? (Asking about the owner of the book)

   * Whose car did you borrow? (Asking about the owner of the car)

   * Whose are these keys? (When the noun is understood from context)

 * Structure:

   * Whose + noun: "Whose jacket is this?"

   * Whose + verb (often "to be"): "Whose is this?" (Used when the noun is implied)

2. As a Relative Pronoun:

 * "Whose" introduces a relative clause that provides more information about a noun, specifically indicating possession. It can refer to people, animals, and even inanimate objects.

   * For people/animals:

     * She's the artist whose paintings sold for millions. (The paintings belong to the artist)

     * I saw a dog whose leg was bandaged. (The leg belonged to the dog)

   * For inanimate objects: While "of which" is also possible, "whose" is often preferred for its conciseness and natural flow, especially in less formal contexts.

     * This is the building whose roof was damaged in the storm. (The roof belongs to the building)

     * I watched a movie whose ending surprised me. (The ending belonged to the movie)

Key Distinction: "Whose" vs. "Who's"

This is a common point of confusion because they sound identical.

 * Whose: Indicates possession ("belonging to whom").

 * Who's: Is a contraction of either "who is" or "who has."

Trick to remember:

Try replacing "who's" with "who is" or "who has." If the sentence still makes sense, use "who's." Otherwise, use "whose."

Examples:

 * Whose car is this? (Meaning: "To whom does this car belong?") - You can't say "Who is car is this?"

 * Who's coming to the party? (Meaning: "Who is coming to the party?") - You can't say "Whose coming to the party?"

 * Who's got my pen? (Meaning: "Who has got my pen?")

By understanding these distinctions and practicing with examples, you can confidently use "whose" correctly in your English communication.