to have been doing 和 having been doing 有什么区别,重点是have 和having说没有这两个语法现象的请绕道

be said to be doing和be said to have been doing的区别 have been doing ,have done和have doing区别 We have been happy to continue doing have been do和have been doing的不同 I have been dreaming to be a teacher all the time.all the time 和have been doing是否重复? to have been doing 和 having been doing 有什么区别,重点是have 和having说没有这两个语法现象的请绕道 have been doing 和was doing的区别 存在have been doing、have being doing、和have be doing吗? have been doing sth have been to do什么意思?他和have been doing,have been done,have done有什么区别?例句：Chinese authorities say Russian experts have been on hand to support the entire mission. to be done to have been done to have been doing 形式的造句, i have been to和i have been doing 和i have been.区别i have been to和i have been doing 和i have been+done内些的区别~解释清楚点,内些死定义不太明白譬如说 我已经读过这本书我曾经买过一辆车都怎么说， have sb done和have been doing有么? have been doing 和have +动词过去分词的差别. have been doing have done 的用法和区别 have been doing have done 的用法和区别 有没有is said to have been doing的结构 to be doing和to have been (求助中……有这个用法吗?)to be doing 不是不定式表将来吗？