请问是否存在have been being doing sth.我是一个初中学生,正在学习《新概念英语第二册》.我已学英语时态中的have been doing sth.（现在完成进行时）,又想到在been后插入being（be的现在分词）也无妨,

请问是否存在顺反异构? 请问：夏朝是否存在? 请问是否存在have been being doing sth.我是一个初中学生,正在学习《新概念英语第二册》.我已学英语时态中的have been doing sth.（现在完成进行时）,又想到在been后插入being（be的现在分词）也无妨, have been to 与have been 有什么不同 是否have been to 加名词 have been 加副词? 请问一下have been to和have been in和have been at有什么区别? 请问 I have been underemployed 怎么翻译 请问：有没有must have been? 请问have been 和has been有什么区别 英语现在完成时语法been英语现在完成时 has/have + 过去分词1 请问been是什么意思?2 什么情况下要加been?3 been后的动词是否用原型?请逐一回答,特别是第二问. 英语动词语法解释请问这句话语法上有没有错?为什么?The bugs be found have been solved be found是不是动词?have been 是不是动词?一句话是不是不能同时存在两个动词? 请问太空中太空人是否存在 请问have collected 和have been collecting 有什么区别 存在have been doing、have being doing、和have be doing吗? 请问have not是否等于don't have 请问have not是否等于don't have 请问是have been already read还是have already been read 请问have been already read和have already been read两个都对吗 must have been请问 must have been 是推测某人一直在做某事吗? I have been asked to clean the bedroom请问have been asked