It's important to return the things you borrow on time.
Ted borrows his classmate's textbook and promises to give it back the very next day.
Ted wants to return his classmate's textbook.
Ted gives the textbook back to his classmate early the next day as promised.
Ted brings the textbook back to his classmate two days after taking it.
Ted's classmate is able to used the textbook the next day to do their homework.
Ted's classmate isn't able to do their homework without the textbook and fails the assignment.