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used to (只有过去时形式，没有现在时形式)表示过去习惯动作或状态，这种情况现已不复存在。例如：
He used to smoke a lot, but he has long given up smoking.
在否定陈述句或否定疑问句中，用didn’t use to或used’t to均可：
　He didn’t use to smoke cigarettes.
　He used’t to smoke cigarettes.  
　Didn’t Maria use to be interested in the theatre?
　Used’t Maria to be interested in the theatre?  

在肯定疑问句中也可有两种形式：
Used you to go to the same school as Edward?
Did you use to go to the same school as Edward? 
近义词辨析
use, apply, avail, employ, utilize
这组词均含有“使用”或“利用”之意。
use
强调利用人或物作为工具。
He used up all his resources in experimenting with the new paint.他为实验新的涂料，花光了一切钱财。
apply
指把某物或某种方法、原理等加以应用。
We should not only know the theory but also know how to apply it to practice.我们不仅要知道理论，还要知道怎样把理论应用于实践。
avail
指使用就近的或他人给予的东西，或使别人为自己提供服务。
I don’t think complaints will avail you much.我觉得抱怨对你没多大用处。
We avail ourselves of every opportunity to speak English.我们利用一切机会讲英语。
employ
指使用未被利用的东西；用于人时表示雇用。
He does’t know how to employ his energy and time.他不知道该怎么利用他的精力和时间。
utilize
指充分发挥某物的作用，使无用的东西变有用，或使人或物有新用途。
She hopes to utilize her artistic talents in the job.她希望在工作中发挥她的艺术才能。