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。
