否定形式是否有didn't used to

否定形式是否有didn't used to be used to do sth.否定形式是什么?也就是说,didn't used to do 还是didn't use to do Didn't use to与Didn't used to差别.它们都是use to的否定形式,但它们之间有什么不同啊,那个d的区别. use to do的一种否定 形式是：didn't used to和didn't use to ? used to do的否定used to do正式的否定形式是used not to do,口语中可以说didn't use to do .我想问,其他动词的否定都是在其前面加didn’t或者don't等助动词,为什么used to do的正式的否定形式要在used后面加 是didn't used to 还是 didn't use to 一般过去式第三人称单数形式否定句是加didn't还是does't? 英语搭配?be used to doing 的所有否定形式?didn't use to 对么? used to 过去常常.是过去式,可有一句话he didn't used to.存在吗/ Didn’t he go to school yesterday?这是什么句,祈使句的否定形式吗? 否定句中,动词用什么形式He didn't （是eat 还是ate） anything. didn‘t be 与weren't有什么区别The foreigners （）there ,But they （）the food there at first A.used to live ,didn‘t be used to B.used to live ,weren't used to C.are used to living ,didn‘t use to D.used to living ,usedn't to must的否定形式有两种:must't和can't,needn't 这两种否定形式有啥不同啊? don't的否定形式 used not do和didn't used to do有什么区别前者是做情态动词吗? used to do改为否定句Jack used to live in a small village with his grandpa.改为否定句印象里不是应该在used和to之间加not吗?为什么答案是didn't use to 英语：“used to do sth”的过去式是“didn't use to do sth”吗?不好意思啊，是否定式。 You used to be short ,didn’t you?