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Let's say you do not have an eraser, but you know that the student sitting next to you has one in their desk. This classmate is not at their desk right now for you to ask them if you could use it though. What would the right thing be to do in this situation?
You can either ask someone else for an eraser, go to the back cupboards where there are TONS of erasers, or wait for the other student to come back so that you can ask them if you can borrow their eraser.