Grouping and ungrouping objects is very useful in many different ways. In the last lesson I had I needed to put a character in a boat and have it sail across the ocean, however; there was no way to keep both together. It's also helpful if you need to copy or delete multiple thigs at once to save time in lesson preparation. Fade In and Out and Fly In and Out are also important. I'm teaching to young children and object animation helps hold their interest.