used to表示过去经常，以前常常(现在不做了) 例句: 1.We used to go there every year. 我每年都去那儿。 2.He is not what he used to be. 他已不是旧日的他了。 3.English gentlemen used to employ correspondents to write them once a weekfrom London the gossip of the court and of the town. 英国绅士们曾经雇佣记者把伦敦法庭和市镇的杂谈每星期给他们写一次。
4.I used to be able to keep two assistants, but now I only keep one. 我过去还有能力雇用两个伙计，但是现在只雇一个。
5.People used to believe that the word was flat. 人们从前认为地球是扁平的。
6.Export taxes on cash crops have also been used to encourage the productionof domestic food crops in order to attain self-sufficiency. 还使用经济作物征收出口税以鼓励国内粮食作物的生产，从而达到自给自足。