这件事情是发生是过去的,属于过去式是为什么要用助动词do，而不用are这里的afraid 做动词用，所以用didafraid是形容词啊我弄错了1． used to do sth. 过去常常做某事。（现在不做了）例如：My father used to be a teacher.He used to have long hair.其否定形式常用didn’t use to 或 used not to。例如：She didn’t use to / used not to wear a skirt.2． be used to sth / doing sth.习惯于某事或者习惯做某事，其中to为介词，其后跟名词，代词或形容词。例如：I am used to getting up early.I wasn’t used to city life, but now I have got used to living in this city.