在“名词1+动词+名词2”结构中，若要与名词1比较，则比较部分应为：名词3+助动词，请问在什么情况下，助动词提前使用倒装句？

例：Because the Earth's crust is more solid there and thus better able to transmit shock waves, an earthquake in the eastern United States will typically devastate an area 100 times greater than will a quake of comparable magnitude occurring in the West

主语相比较，要尽量补出谓语助动词。补出比不补出好，但不补出不一定是绝对错误。补出的助动词在 than 后一般位于其主语之前。但也可位于其后。

She plays piano better than I do.