* The teacher gave us a pop quiz. (The quiz is the direct object, and "us" is who the teacher is giving it to.)
* My friend sent us a postcard from their vacation. (The postcard is the direct object, and "us" is who the friend sent it to.)
* The store offered us a discount on our purchase. (The discount is the direct object, and "us" is who the store offered it to.)
Remember: An indirect object receives the direct object. To check if you've used "us" correctly, ask yourself: "Who is receiving the direct object?"