后面加名词或者形容词,例如:

1、Politics used to be the perquisite of the property-owning classes.政治曾经是有产阶级的特权。

2、Eating in East Berlin used to be a hazardous and joyless experience.在东柏林就餐曾经是一件危险而且沉闷无趣的事情。

3、Things ain't what they used to be.现在情况不比从前了。