To exaggerate:to describe something as larger or more important than it really is.(这里前面是实义动词describe，为什么用is，而不用does)，比如: 1.He is 3 inches taller than she is.(前面是必动词，后面she后面也用必动词) 2.The woman weighs less than he does.(前面是实义动词weigh，he后面用does)