Complete the sentences with can, must or mustn't.

Let's complete the sentences using can, must, or mustn't! 1. You've finished your chores, so you **can** watch TV now. 2. Turn off the tap. We **must** save water. 3. **Can** I borrow a book from your bookcase, please? 4. The sink is dirty. I **must** clean it. 5. You **must** tidy your drawer. It's very messy. 6. Be careful with that mirror. You **mustn't** break it. Explanation: * **Can** is used for permission or ability. * **Must** is used for obligation or necessity. * **Mustn't** is used for prohibition.