used not to do didn't use to do sth 区别

英语：“used to do sth”的过去式是“didn't use to do sth”吗? used not do和didn't used to do有什么区别 used to do 的否定式didn't use to do 中的use怎么读? use的用法.used to do sthbe used to do sth be used to doing sth use to do的一种否定 形式是：didn't used to和didn't use to ? 'didn't used to do sth' 为什么前面用了过去式后面还用used? used to do sth. used to do sth Do not trr to do sth 与Don\'t try to do sth的区别 get used to do sth ,accustom区别 use sth to do sth 区别(used to do sth 和be used to