请问一个英语问题：I did not understand the problem.He explained it 两句连成一句新二书中为：I did not understood the problem until he had explained it 为什么 后面不是：he explained it 难道不应该是：不懂这个问

一个英语小问题Not until I came home last night did mum go to bed为什么用did mum go 请问一个英语问题：I did not understand the problem.He explained it 两句连成一句新二书中为：I did not understood the problem until he had explained it 为什么 后面不是：he explained it 难道不应该是：不懂这个问 问个英语问题 James has just arrived,but i did not know问个英语问题James has just arrived,but i did not know he_ until yesterday.a.will come b was coming c had been coming d 英语问题excuse me.What did you say just now?I ____（not listen）think可延续吗？ I did not ask 问句英语请问You still love me,right?I am really confusedIf so,Why did not you tell me? whether u want to know more about me or not,i will did so什么意思 But I did not,这句英语的中文翻译是什么意思? 英语改错 Not until did I realize it was my fault,did I apologize to her. 英语强调句式it is that的2个问题有2个句子,哪一个句子正确?It is not until he saw me that did I recognize him.It is not until he saw me did I recognize him. 请问这句英语句子的对错?I did not expect her to be absent 可不可以写成I did not expect that she is absent不对请说明原因!谢谢 新概念英语2 第三课问题,but i did not understand a word (意思是一个字也不懂,那为什么要加个did?）原文是Postcards always spoil my holidays.Last summer,I went to Italy.I visited museums and sat in public gardens.A friendly w 请问一个when和while的问题 while my mother was coming back,I did my homework不行么? I did not enjog itenjoy 请问下新概念英语2中14课 其中一句i do not know any french at all为什么不是did 不是过去发生的事情吗 这些英语句子问题在哪里,thank1.my university life have 8 mouths 想不到 2.time spent at university is a the most worthwhile period in a young person's life,so did i是不是so did i 改成so i did 3i find it different from my imagine of u i am not u husband I did not buy anything.He did not,eith